War does not determine who is right... only who is left...
Keeping in mind that Dreadnoughts are Tankish--therefore not a high damage output class of ship. I think Lando offers and outlines some very good tactics for dealing with pesky Artillery Cruisers. Perhaps, the only thing I might add is remembering to Warp in with a full magazine and full energy bar--while using PtW (Power to Weapons), PtS (Power to Shields) and PtE (Power to Engines) accordingly and judiciously. 
Yes, AC's seem invincible or "OP". Yes, they can get annoying. And finally, yes, a group of well-seasoned AC's working together as a team will whittle down any player (new & old) in a manner unbecoming...lol. In many ways, it's an outcast cancer stick ship class--some more than others.
Frustrating, yes. I've been there. In the beginning, on principle, I avoided the AC class...lol.
But again, as Lando eloquently states, "...stick with it; your experience WILL get better and you WILL have more fun the further you progress."--not to mention find tactics to counter or employ.
However, keeping in mind, that's not to say AC's don't have their weaknesses or shortcomings--built into their strengths
which applies to most ship classes as well. In "sticking with it" you will come to despise and love each with their different flavors and characteristics.
To the point(s) being made...
PeaceKeeper#1936 posted (#post-205407) said:
Btw my ratio defeat/victory is 1.8, failling cause snip.
I play ALL class except snip ! I even haven't the first !
For continue my topic i will say that i see a lot of snip in MVP like 11-2 or worse !
I very would like more opinion.
At pleasure.
In general, as a T3 (Tier 3 player) the transition from Recruit to Veteran can be brutal. In Recruit matches fully researched T2's will have an advantage over newer T1's...likewise it could be said that a stock T3 will be at a disadvantage against a T4--and so on, and so forth. Resulting in a decrease in W/L ratios. Do not be discouraged.
It happens. The knowledge gain from each battle won or lost will aid in spotting what tactics work--and when to use them. 
There are many reasons to avoid playing certain classes--but I would also offer that by avoiding classes (snipers, in this case) there's a chance to miss out on a whole lot of fun--not to mention finding out the limitations and weaknesses of each class. In playing any ship, if there are difficulties with the ship, it's a good bet that might be one of it's weaknesses. (One example--most snipers have a fairly narrow cone arc at close range vs. long range--not to mention player focus)
And there are many more. 
Stick with it and keep trying new tactics. Find those blind spots and most importantly have fun. 