Clanbase has thrown together a nifty column/review of beta 6.5, featuring some solid opinions on the gameplay. Here's a snip:
My feelings exactly. I can't mp5 snipe anymore! *sniff*The game is demanding much, MUCH more of your PC. On maps where I used to get between 35 and 72 FPS without problems, my FPS now drop below 25. Playing with a FPS of <25 is like playing with huge packetloss. So they made the netcode better, but the FPS worse, causing you to have 'the same lag' as you had before.