Oberon Destroyers are very OP in legendary. With thier ridiculous speed and manueverability, coupled with the plasma ram module it is far too easy too get kills. They need to be nerfed to bring them down to better match the other destroyers in-game. Further more the plassma ram module is way too powerfull, it needs to be changed. In order to do damage the ship using the ram should have to be travelling at maximum speed, none of this brushing the nose nonsense. Furthermore, the ramming ship should be damaged in the attack, not catastophically, but a decent amount.
Akula Vector Tactical Curisiers are also very OP in legendary. Their primary healing beam weapon is very OP, to the point that it can add HP to a ship being attacked by mulitple ships at once. The "damage" output of these weapons is ridiculous, and coupled with the poor speed and manueverability of these ships, teams will often adopt a, "turtle" strategy. This gameplay style is very prevalent in legendary and is almost impossible to defeat. More often than not matches are slaughters instead of real battles. The current nature of the ship itself is very toxic and almost always leads to terrible matches.
Finally, the grind wall after tier IV is unbelivable. It is difficult enough to fully outfit a tier IV ship to your liking, let alone five of them like I have. The progression system in the game is very under rewarding for the work put in. Even with Elite Staus is takes much longer than it should to unlock modules and ships.
I find my self playing in Veteran now instead of legendary because of these issues. Veteran is a perfect example of fair, balanced Dreadnought gameplay. However the fact that I cannot use the ships i've worked so hard for becuase the only tier I can use them in is completely broken is an insult, especially considering how long these problems have been in the game.
In short, either fix the problems above, make tier IV ships more competitive in legendary, or add tier IV ships back into Veteran. Or else it is practically impossible to progress and enjoy this game beyond tier III.