This boils down to how you want the battle to play out...asking you to try each class does seem to waste time, but do narrow it down to abt 2 and try them out to see which one you like.
Basically...3 types of skills: Combat, Tech, Biotic
Combat -> Cuts down enemies fast. Direct style of play and kill. Ammo types is good for cutting down all types of enemies and barriers, shields, armor. Killing blows include concussive shot.
Tech -> Controls battle field. Manipulate enemies (Hacking, drone). No killing blows. Cryo and Incinerate does slow down enemies.
Biotic -> Controls enemies. Traps enemies (pull, singularity) with a sort of ok killing blow like throw. Warp is an extremely good power for enemy barriers and armor. Contrary to what is explained in vids, it does damage to shields too.
So for what I have tried...
Adept (playing now). I believe this is the all rounded class cause all biotic powers are available and each one has a use for diff situations. I bring around combat characters for the kills. However, with pull-throw combi, I can take down enemies on my own too. On top of that, with singularity and shockwave, I can defuse crowds. With warp, I can help my team bring down enemy barriers for them to finish the kill. And when you master how to arc powers around corners and cover, NO ONE can hide from you!!! Adepts can kill behind cover without firing or moving to the next cover. Distance is not a problem for them.
Vanguard. Fun class to play with. Cryo ammo combined with charge is very effective in killing off enemies. However, charge is dangerous when u r off into groups of enemy without your team. Also, not a very good class at bringing down enemy barriers, so have to always rely on team mates. Incendiary ammo can only do so much. You can charge and blast them off with shotguns but...still it's dangerous.
Sentinel. Superb in support. Overload, Warp. You can laugh at any enemy barriers. Cryo blast with throw is again an effective way in killing off enemy. Tech Armor is extremely useful when playing at higher difficulty levels. However, with the lack of ammo and weapon training, you have to stay behind a lot. You will actually see less action than the adept.
Others I didn't try...and won't
Engineers. Some swears by it, but tech skills are way too limited if you want to move thru a battle fast.
Infiltrators. Stealth play is just not for me. Cloak is a great backstab or escape skill but that's all. I prefer in taking out groups instead of one.
I may try...
Soldiers. Guns and Ammo. Adrenaline rush is good if you wan to score more headshots. Not that you can't do it with other classes, but it is difficult with enemies moving around so much. Concussive shot is good killing blow if you have someone biotic pull the enemy for you, like Jacob.
So there you have it...my experience with the classes. As you can see...I do support biotic over tech. I only like cryo blast. Also for me, combat is about = biotic.
[Edited by EverteMax, 2/4/2010 1:39:49 AM]