I've got a Nexus 7 OCed (1.5ghz CPU, 520mhz GPU) and a stock Galaxy Note II, and I have to say that every single game you can think of in the play store runs miles better on the Note II, even the so called optimized-for-tegra titles.
What's bothersome for me though is that some tegra optimized titles actually run on a low resolution by default on the N7 (to compensate for low memory bandwidth???) yet still play on a 30-40ish frame rate, luckily the devs have put resolution option in the setting (see Riptide, beach buggy blitz), but you'll be playing at 20-30fps if you bump it up to the max/native res.
Another title, Horn, which is actually a Tegra exclusive using UE3, actually runs on a low res but does not provide any option to change that, and even with the low resolution, it is extremely choppy at times I can easily notice 15-20fps.
One dev that I like is MADFINGER Games (dead trigger, shadowgun), their titles are so heavily optimized that they run at a consistent 35-45fps on my N7 and I do not notice lag nor inconsistent frame rate. still runs at constant 60fps on my Note II though...
Meanwhile I can't think of anything that doesn't run at 60fps on my Note II, So much that wonder how much better the gpu performance is on Snapdragon S4 pro and apple A6 devices.