I've been kicked three times in the last two nights and I still don't know why

It's probably because I have poor stats and they're making space for clan-mates, but it's still frustrating.
What's also depressing was watching some youtube footage last night of a bloke playing - it wasn't that he was a good aim, it was the fact he was just so clever about the game. After clearing a MCOM point, he dropped his Assault kit, picked up a medic kit and rez'd everyone, then nabbed an Engineer kit and fired a couple of Gustav's through a window, taking out a light tank and finally ran off towards another target. It was awesome just to see how decent players move around the map. When I was playing Q2, back when my reactions, aim and instincts were sharper than what they are now, my friend used to come over just to sit behind me while I played and watch what I did - I never understood why until now.