i can agree with others about it being a bit too hectic, reminds me more of the old quake days than anything else which is fine if you enjoy those twitch fps games.
Myself i normally prefer a slightly slower pace of my FPS so id prefer the battlefield type multiplayer than this.
Buy at launch? Not for me, ill wait till its been out for a while and reduces in price. Will be interesting to see what Respawns approach will be to future DLC, map packs etc as i seem to remember them charging for pretty much everything with MW.
Something different which is always nice, but based on the beta ill wait to see some reviews before i consider a purchase