So yeah, now that I have unlocked the engineer class I must say again that I really like this game. Deployable turrets, repairing base turrets, generator and radar and defending the flag is a nice mix of possibilities for this class. CTF (and prolly AD, but havent unlocked this yet - will come at lvl 8, and im lvl 5 now) is really the way to go with this game, as that is where the different classes shine in their roles.
It really has the look and feel of the old Tribes games: it is fast paced, has vehicles that offer extra tactical options while not being über and offers good possibilities for team play.
You start out with the 3 basic roles (light, medium, heavy) and can unlock more specified roles for about 7k XP (as comparison, for me as a mediochre player, I get around 1000 XP per game in general). Weapon upgrades are doable too, xp cost wise. Unlocking new weapons is very expensive (70-100k), but I still think they offer not that much of an advantage over new kids on the block.
What I don't like is that my videocard crashes after every 1-2 games. So will buy a new card for this (and other games that didnt run that well on my current 2nd hand card). I'm thinking a 6850 for €120,-. Matches my budget...