This game is falling right into the category that all the Treyarch CODs have fallen into for me. Almost every aspect of the game feels just slightly behind the Infinity Ward games.
To be clear, I'm not shitting on Treyarch, and I don't think Infinity Ward is perfect. I just feel Infinity Ward delivers the tighter, more intense experience.
Lots of these differences are small, and nuanced. Like the player movement in BLOPS 2 just feels slightly looser, as does the hit detection. I love the sound of hit markers in MW3, but they're missing in BLOPS2. Sometimes about downing someone in MW3 just feels right, and it feels just slightly less "right" in BLOPS2.
In MW3 the guns sound angry and dangerous, and some even rumble the subwoofer. In BLOPS2 most of the guns sound similar, and have little low end kick. The entire sound design of BLOPS2 is very samey to BLOPS, but with more reverb added. I prefer the sound of silencers in MW3, as well as grenades hitting the ground, flash grenades, etc. It all just sounds right in MW3, and not quite right in BLOPS.
Even the gun models in BLOPS 2 look weaker than MW3. The MP7 looks better in MW3. I can't give a technical breakdown of why, but it just does. Texturing? I don't know. I just know the guns are the star of the show, and they excite me more in Modern Warfare games.
Overall I definitely think BLOPS2 is a step up from BLOPS, and I'm happy about that. I just know the real meal comes for me next year, on the next gen Xbox, with Infinity Ward at the helm again.