Anyways, I'm loving it so far. I've been playing with only the Medic so far (he's level 23 ATM) and got through all the campaign as well as the first 4 challenges with him.
What I really love about this game is that the campaign manages to be difficult without feeling utterly impossible. Raze 2 did that terribly wrong by making the latter half of the game effectively a 1v9 in that the enemy team was legit and all your team did was help them win by dying over and over again. This campaign gets rid of your teammates entirely near the end, which is nice because that means they aren't feeding the enemy kills, and also challenging because 1v4 Domination is no walk in the park no matter what you're doing.
It could benefit from a survival mode though; I remember Raze 2 having that... oh well.
I find the challenges are not as hard as they say they are. I have all my guys around level 18. I got stuck on the campaign lvl 14 but still managed to get to lvl 11 of the challenges.
Level 4 of the challenges is all about finding guys to KS and making 1-1 trades with enemies. As long as you don't trade deaths with the same guy too many times you'll be fine. The AIs don't get kills on each other fast enough to be of any real threat unless you suck, so as long as you get a kill on every guy who kills you, you won't have any problems winning.
For campaign 14, three tips: Look up when you start the level, figure out the point at which you can drop your parachute without the fall halting your movement, and use a Medic with a Colt (or a similar setup with another class). It's a 2 or 3 hit kill on all but the Tank, who goes down with 4 or 5 shots. The enemy takes longer to respawn than you do, so if you manage to wipe all of them that's a good 10-15 points before you have to start shooting again.
For level 14, I played a Command with the OICW. 1-4 shot everything but tanks, I killed four of them for every time I died. Still, the respawn rate is killer as a few of them land and take the capture points. I think I won that match 100-80ish. It was intense.
Im stuck on lvl 14. But the thing is that i have lvl 20 on the assasin and lvl 3 on commando and lvl 3 on tank. So im kinda stuck. How do i beat the level with assasin?