The only one I don't like is Arkaden. And that's only because I don't do well on it. (I noticed that this is the reason for most people's dislikes of one or more maps.) I have tried camping, run-n-gun, stealth, brashness, and more styles and unless I go against a pretty bad team or I am with at least another strong ally, I end up negative. (I wonder how much of that is due to hacking, though. I have never seen so much warping in MW3 as I have seen on that map.)
On the other hand, I really like the overall designs of just about all the maps. These maps really are different from previous CoD maps, which means a gamer's play style has to change to compensate. As others have mentioned before, BO had more tactical, methodical gameplay (that's not to say you still couldn't run-n-gun). Most MW3 maps make it more difficult for that kind of play, although I submit the following in support of tactical play in MW3:
-Recon Pro is awesome if you play as a team. A medium-to-long range tag can help SMG users put the enemy down. RP (enemies are tagged for 6 or 12 seconds) can make your team seem like it has inifinite UAV when it doesn't.
-Portable Radar is awesome if you play as a team. Multiple PRs spread out across an area of a map can make it seem like your team has infinite UAV when it doesn't.
-UAV-only streaks are great if you play as a team. This isn't infinite UAV, but if you have a teammate who has hardline as a second tier perk, the UAVs come in every two kills.
-Aligning perks across team/clan members works very well. One person can do recon, another can shoot from medium/long range, another be a tank, etc.
With these tools and play styles, MW3 can become a very fun, tactically based game. If enemies figure out your tactics (someone is running assassin, dead silence, or sitrep), then you have to change styles to adjust.
My biggest issue with the ACTUAL game (not hacking) - and it always has been - is the lag. First, I was going to throw the game in the garbage just before lag shooting became lag compensation. That made it better. But it's so dang frustrating to play a match and go 25-3-6 and then the next match go 4-5-15 because the first game, people just stood there (I know they really weren't; it was LC), and the second game, I was instakilled with heatseeking laser bullets (that's LC, too). BO had this right; MW3 still hasn't found a happy medium. What's worse is that if I try to "fix" this by using a LAN adapter to connect, the LC gets worse. I get killed out of nowhere from people I can't see from around corners they haven't even come CLOSE to passing yet (on my Wii, at least).
) its gameplay is more-or-less the same as MW3's. Its the same run 'n gun action. I mean, MW3 is as tactical/methodical as a newborn baby, but thats the entire series, not just MW3. 
