gunzerker is awesome if you spec it right, i am basically a bullet and health regenerating machine now when i click gunzerk, i cut through badass loaders like butter
mechromancer's just goofy fun, i laugh every time i hear some bandit scream offscreen and see xp pop up
i don't like assassin because his skill suuuuuuuuuuuuuuuucks at the beginning of the game
siren isn't that great at the beginning, either, phaselock is fine but when you have a group of bad guys charging you it's hard to focus on just one
commando is great for shifting aggro away, and that's about it - his dialogue kinda sucks