Oh, my friend, prepare to read a looooong comment.
Out of the 3 types of vettes, fulgora my least favorite. It is kinda boring for me and I dont like the looks of it. To top it off, it is the slowest among the 3 corettes. My first thoughts on the ship were "This thing is useless".
However, it isn't nearly as useless as you may first think. As mentioned previously, this ship does not pack as nearly as much burst as the other 2 corvettes, however, it fires at a 360 degree arc and it is a huge advantage. The default loadout isnt great and it is the least favorite corvette of mine (because its kinda boring for me) but even in default loadout you can make it work. When I was grinding this ship to unlock vindicta, I just substituted autorepair with afterburner and thats was enough to make the ship the best kite you can make out of a T3 ship.
Basically, think of it as a destroyer with much survivability. This ship isn't great at bursting targets down, however, it is great for providing support fire and finishing off low hp opponents, as well as countering other vettes once you get used to the projectile speed (which isnt that bad tbh). I found that it works best when you just kite opponents with it. Dont count on bursting anyone, just fly circles around them, and believe me, they will hate you for harassing them. You may not always get a kill if your enemy is defending well, but you surely will put out at least 1 enemy out of the fight if you continue to annoy them with your attacks (provided you don't die). For organized teamplay, oberon corvettes are most widely used.
The decision of what modules to use is up to you, but the best and most overpowered module you can use on any corvette is disruptor pulse. The damage is negligible but it provides tremendous utility for you and your team. For 8 seconds (T3 disruptor pulse) you can make any ship nearly helpless(unless they have the raw firepower to kill you within that time and you let them). Disruptor pulse can disable any module on multiple ships at once if they are clustered together within 1.2km of each other(usually a dread and his healer). When combined with your drain torpedo, you leave your target completely defenseless for 8 seconds(T3 lvl modules). This is enough to kill any ship if your team is focused on them(unless they are getting healed well, of course) or anything short of a dreadnought that isnt killing you faster (T4 destroyers within effective range of their flak turrets (800m)). You can reliably kill 1 enemy per minute provided that you are not getting killed yourself and they do not see you coming. The enemies I am talking about are artillery cruisers, which should always be your primary target, since they have the most difficult time killing you. You can also try healing busy tactical cruisers, however, they are much harder to bring down due to their better defenses as well as their positioning close to their teammates (unless they are performing very poorly or had an unlucky spawn away from their team).
You have to have a predator mindset when you are in a vette. You must avoid facing enemies head on and wait for an opportunity to strike. Most importantly, THERE IS LITTLE A VETTE CAN DO IF YOU SEE IT COMING no matter how great your dps is. If your team is giving your opponents a real pounding and the opposition is focused on keeping themselves alive instead of looking for targets to kill, then you are in luck and you will have plenty opportunities to kill someone that is unaware of your presence or finish several opponents off. This is not always a case, however, and here is the best part about fulgora (and all oberon corvettes). You don't need to fire while being stationary and can provide some dps on the move while avoiding fire yourself (this is where 360 degree firing arc comes in handy). Combine that with disruptor+drain flybys and you may find yourself actually helping the team bring down an enemy dread. I don't promise you any kills here, but draining and disrupting a dread is great help, since you are creating a weakness in the team's strongest link and create an opportunity for a kill (or at least an opportunity for better positioning if the dread manages to retreat instead of getting killed while under your debuffs).
Another advantage of the 360 degree firing arc is that you can actually play this vette defensively. You can kite other vettes and harass them away from your healers and artillery. Say and enemy team has 1 vette that is constantly trying to flank your team. That's where you come in, give him a hard time, keep your team safe (not always good for your score, but can be the difference between winning and losing a match). If the enemies are to stubborn and still go for your arties, you can go ahead and kill them when they get too close.
To sum it all up, your main purpose is to disrupt the enemy and prey on the weak, be it to provide a little dps to finish off enemy dread that your team tries so hard to kill or go for that arty in the back of nowhere that is firing on your dreads and destroyers (mb even sneak up on their healer if there is an opportunity to do so without dying before you get him).
Forget the burst, you kite and kill your enemy more gradually than other vettes, think of it as a duel (but dont forget to watch your surroundings for more enemies). You can also just fly strafe runs around the enemy without putting yourself in too much danger, harassment is always annoying to the enemy and you may actually be able to shift their focus on you instead of focusing on your dread. Provided that you have an ability to escape, its perfectly fine to distract the enemy so your team can make a move on them. Think of yourself as a squishier and more mobile close quarters destroyer with corvette modules.
Advantages of fulgora when compared to other classes of vettes:
-360 degree firing arc!
-fastest turning speed
-ability to provide support fire on the move without penalizing the accuracy of your shots (once you get used to the main guns)
Disadvantages of fulgora when compare to other classes of vettes:
-Much less burst damage(enemy may react and activate their shields before you kill them, which leads to greater time to kill and greater chance to die for you)
-Slowest travel speed (especially when you dont set power to engines)
-low projectile speed on the main guns(can be hard to hit moving targets, lots of practice is needed to compensate for this)
Remember, it is possible to go on crazy streaks with any vettes once you get good with the ships. If get 10+kills and 2< deaths while being in a vette the whole game, means you are able to perform descently in a vette. If you manage not to die at all and get at least 5 kills in a match, you are on the right track. Try going on streaks in recruit matches to get a hang of the mindset you need to have when playing a vette (pret on the weak, seek opportunities for kills and execute them with precision).
Oh, and forget power to weapons with fulgora, most of the time it is not worth it to remain nearly immobile after you kill someone, power to engines is the way to go with this ship.
Let me know if you have any other questions.