Good but just one HUGE FLAW!!!
So, let me start with the good points first.
1. AIs are much smarter, more humanlike.
2. Incredible graphics.
3. Nice mini cut-scenes in the middle of the game.
4. Good sequel.
5. Realistic gameplay.
6. Amazing dialogues.
7. The new Kill Streak and Death Streak modes are fair.
The new combined Special Ops, Multiplayer and Survival mode give gamers more than what they bargained for.
Some parts of the campaign makes you cry if you're sensitive enough. (My friend actually cried...)
The Multiplayer still guards its "solo" mode, with more air support.
The bad parts of MW3 are:
1. Soundtracks are not as good as MW2
2. Ghost didn't make it...
3. The campaign was beating around the bush, not direct to the point.
4. Too many camping spots in Multiplayer maps.
Just WHERE THE HELL is the AI mode in Multiplayer???
OMG this is like the biggest flaw Activision, Infinity Ward and Sledgehammer Games could've made...
Ais give you the training you need or else rookies will get their asses whooped in Multiplayer.
They should seriously correct this mistake in future titles. Otherwise, MW3 is worth your money, go for it.