All these apps, and also all other available, are full-featured and work like a charm. They open fast and run great; there’s nothing negative to say. The smaller RAM does not mean a worse app experience, only a slightly smaller selection.
Mostly apps not available on the 720 are high-end games like Modern Combat. Only Temple Run is a game which should normally work but does not.
Not all higher performance games are excluded however. Dredd vs Zombies and also Asphalt 7 works great. Both games run smoothly and have great graphics. Only loading times are slightly longer than on higher-end devices.
I am still however of the opinion even these high-end games should work. A mid-range device should be able to handle this (maybe not on the highest graphic level, though) and given that Android and iOS devices can do this, a Windows Phone should also. The iPhone 4 still can play all games without major issues and also mid-range Android devices can handle these games as well.
As you can see the Lumia 720 provides an almost complete experience when it comes to apps. However, high-performance games don’t work, which is a pity since they should do so. People who don’t use their phone to play games, however, should be perfectly satisfied with the Lumia 720.