I voted that they are all balenced mostly because they are!
I don't get why every one says that the darktroopers are horrible, you just have to know how to use them. Yes in most cases their gun is total crud because you cant kill from distances like you can with the sniper or ordanary blaster; but thats why God created jetpacks! If you can get in close with a darktrooper its a one shot KO. Same with the Destroyer Droid. If you get in close to an Arc Trooper the blast radius will kill him to and only deplete your shield. The Clone Troopers don't have much against you so the only things to watch out for are Jet Troopers and Vehicles.
Wow; that was a big post for me