I played MW3 for the first time since BO2's release and had a lot of fun. My whole issue with MW3 was that I got too burnt prestiging to 20 and hardcore went to ricochet after one month. BO2 is still fun but honestly all these cod games feel like copy and paste versions of each other with a few tweaks. The engine is great running at 60fps but it looks like the past cod versions.
I think this BO is the best of the lot, personally.
Had major probs with earlier versions, like a lot of you are having on BO2,
i stopped playing MW3 after a month or so and didn't touch it until a few days before BO2 release.
Have to say, i don't know what they did, but they made it a totally playable game. Think they must have patched it the right direction for me.
Im really enjoying BO2, but MW3 is much less rage inducing these days.