I voted "Do not like CoD" though that's a bit of an overstatement. I played the first title's demo, tried CoD3 at a demo kiosk, and bought CoD4. I haven't played any of the others at all.
CoD4's single-player was fun the first time through, but afterwards is just tedious. I don't think I ever played the multiplayer after hearing of the antics and shenannigans going on... and certainly looking at how the play progresses there are serious balance issues.
I'm not going to say I don't like the series, but I don't like them enough to buy them or play them very much. (Indeed, some day I need to trade in my CoD4 for some in-store credit... maybe when I go get Fallout: New Vegas over the holidays.)
-- Steve