I realize that the developers are still learning the ins and outs of the system to get the games running with a decent speed, but it's still very apparent that neither of the next-gen consoles are super-computers they were advertised to be. If they were, you could easily throw any of this normal stuff at them and run it on 720p 60fps.
Reality seems to be entirely another thing. It seems that even the big developers are struggling hard to get games running at even at 30fps and in the end have to cheat by lowering the resolution.
Saints Row for example was supposed to look like its ace-looking interludes, but the frame rate was so appalling they had to cut a lots of things from the final build, even after taking extra six months for development. Don't get me wrong - Saint's Row looks good, but it could've looked much, much better if the developers would've had it their way and didn't have any problems with running all their stuff on the hardware.
Splinter Cell is playable when sneaking around, but if you start running around and gunning down the enemies for fun, the framerate will drop to downright unplayable. Also in SC: DA the multiplayer mode has been watered down and stripped from most of the effects to keep the framerate up.
PGR3, COD3 and THP8 all have lowered resolutions to keep up. Crytek says they're cannot put Crysis on NG consoles without compromises.
Unless they are running stuff with just one core now, or if the development tools are dragging behind really badly, I'd say forget about 60fps on x360. Let's see if normal developers can some day do even 720p 30fps without struggling and having to pour money into endless optimizations.