I traded in a bunch of my old games (including blackops) for a strait trade on mw3 that was about 35-40 hours after release. (ps3)
I have to say, even though the graphics are not improved, the game play is solid, I have never played or bought mw2, so this is my "mw2".
Its got a nice campaign where you swing out of spinning copters once again
Its a solid game, and I actually love how they perked up everything.
Spec tactical perk streaks
perks + pro's
There is a perk on everything, it lets me fine tune what I really want to achieve with a class, and its pretty fun.
But going from blackop's to this, I say it was worth it, for me, more shit to customize and waste my life on.