Interesting post, even if you sound arrogant about your opinions. I do prefer the Arkham games' combat to any other 3D action game I've ever played. It's way more fun than something like Bayonetta or Devil May Cry or God of War and it works perfectly for a super-hero game. I'd be cool if Batman had even more moves, but to be fair in this game there's already a shitload.
You gotta consider that this game isn't a straight action game as Bayonetta. Its combat cannot be as elaborated, or else the developers would have to sacrifice some other aspect of the game for it. The same goes for the stealth sections compared to stealth-focused games like Splinter Cell or Hitman. It'll never be as deep, since the Arkham games are not only about stealth.
The closest comparison I can see for the Arkham games is the Zelda series. Both have their attentions divided between equal doses of combat, world-travelling/exploration and puzzle solving. Batman adds stealth to that equation too. And it does all these aspects wonderfully, especially the combat in my opinion. To me, it's the most fun combat system I've ever encountered and I do hope Rocksteady has the chance to expand upon it even further.
The games have to gain points for the masterful use of the Batman license as a whole too.
If you can't appreciate these games in their entirety and have to evaluate them in only one or two of their aspects, I'm not sure you should be trying to be that judgemental of them and their fans.