I skipped out on MW2 and Black Ops because I played both and hated all the added bullshit that broke the game. Multiplayer was ridiculously unbalanced, and I hate the scripted singleplayer BS. I really want to like COD again because COD4 is one of my favorite multiplayer games of all time, but this trailer didn't do it for me. Will wait for multiplayer footage/info.
For me to care about COD again they need to 1. stop tailoring all the maps to run and gunners and make maps that are balanced for all the classes, 2. get rid of noob tubes/rockets or at least only let you have like 1 round maximum, 3. Really balance the perks/extra bullshit so that one particular class doesn't reign supreme all the time.
E3 will be the big decider for me this year it seems. I'm waiting for multiplayer footage of both Battlefield 3 and MW3 before I decide what'll be the main FPS for me. Something tells me MW3 will just add a bunch of more useless shit into MP without balancing any of it and it'll just be a huge safe haven for machine gun 1-shot-kill noobs. We'll see what happens though because Battlefield 3 may disappoint and adopt the same bullshit.