You have to mention that you have all Solaris, which DO NOT hit very well against fighters. Yes, its an anti-fighter weapon, but targeting is off for chainguns. For some reason, it doesn't lead off from the target far enough to be effective.
Not to mention, for a Battleship weapon, Solaris are very, very weak guns.
The Wrath has a high armor rating because of its low attack and low manuevering. With only five forward firing weapons and the agility of a brick, it wouldn't be very effective otherwise.
It is NOT too high, because I have killed multiple player Wraths in my Bomber. Yes, Bomber. The flying boulder. I used no Nanobots or shield batteries, and they did.