I would guess I've been playing 20-25 hours and I can't think of one time I've suspected someone was cheating? A few games with smurfs in, but not a silly amount. I'm also fine if someone wants to use the game type as TDM as that gives my team a better chance of winning.
If you head in the direction of another team straight away, it's not inconceivable you get wiped. As I said, personally I don't think I've seen anyone that I've thought has been cheating. Yes, the occasional smurf owning everyone, but you can see they're just very good.
