i like the ranger, because the cripple strike is useless if enemys die instantly. The Ranger's rampage is nice because I have faster reloading to kill more things and i get more money. Also I don't use the gravity gun, it takes exp from my rogue. Instead i use a grenade launcher.
I use a laser pistol with 3x damage, 2x fire rate, 1x reloading. dalper31, armor penetration bonus over 100% does increase your damage against armored enemies, however i don't really like it because I have a companion with a bowgun with leach that kills armor dudes pretty well and keep me alive.
Never mind my last comment, go to the url below and thumbs up NekoKyd comment. Use ctrl f to find it.
http://www.kongregate.com/games/undefined/arkandian-explorer/comments?sort=rating
ANYONE who has any trouble with game being slow, right click, go to quality, and then set it to low. Thumbs up snorri666 comment, or if your lazy thumbs up this comment so people will see