I despised the first one so much, not as bad as MW2 but I expected much more from Treyarch after World At War. I guess with BO2 there is little chance of any change or the devs going back to when these games were really good and relied on good gameplay rather than aping a Michael Bay movie.
Multiplayer is alright (never tried it on Wii, only PC) though you do get to a point where it becomes boring. What I can say is that the controls on the Wii versions are the better than controller controls.
I liked MW3, well the parts where you actually played it. IT was popcorn fodder. The series is now one of those "borrow off a mate but no way pay any money for it" sort of franchises.
I'd like to see a game set in the 19th century, reload your weapon very slowly, risk it not working...then say "fudge it taste my sword!" adds to the tenseness and also we won't have to see that terrible Price character and wife/daughter beater Billy Murrays awful mockney voice acting.

Also another thing, seeing that we don't have one single FPS on the 3DS, this could be the first perhaps and hopefully n-Space will do fine work on it.