I have been playing the game daily for a week.
But I have yet to try to play online, my logic is that it's a big game and a lot of team work is needed and its important to know the Maps. I have been having some great matches with the Expert AI bots (Smart bastards!). I play as an engineer a lot and really enjoy the role. You are the Defense of your team, so on map where you are assulting it's best to be something else like a soldier.
I think I will start tring to find a good server tonight.
i always play engie unless some other class is needed. hell i've always played engie since RTCW. always been my favorite class because its always needed. whether its for defense, repairing turrets and vehicles, building objectives, attack/support roles, etc. its just too bad you can't plant the explosives anymore. i guess they wanted to give the soldier class a more starring role in the game other than for heavy weapons offense/defense. its turned out quite well though.
nice to see how its evolved as well...
RTCW: You'd be fine just having a team of field ops, engies and medics to complete objectives
ET: Add the covert ops class to steal a uni and get in that door you need to get into. then he can blow up one of the other objectives while the rest of the team moves up to the main objective
ETQW: Gotta use everyone this time around to get anything done pretty much. cops to deploy radar/hack objectives, engies to deploy defense turrets/build objectives, field ops to deploy offensive turrets/give ammo, medic to revive/give health/deploy supply drop, soldier to blow shit up lol