I just tried one of the featured games. It was extremely basic, no sound and pretty lame. Compare it to any of the featured games on http://kongregate.com and you'll see that there's no comparison at all.

I like JS. I'm learning how to use some of its first class functions, and it's really cool! But honestly the only reason I'd play any of those games is because they're written in an interesting technology... not because they were actually more fun than the stuff written in flash.

There's a lot of potential, but the platform isn't quite ready yet.