The problem is that most web developers aren't game developers, and most game developers aren't web developers. So you either end up with demos that aren't any fun, or games that are terrible browser experiences.
Game design is hard, so eventually we will have to converge on a series of design guidelines that make for great browser experiences and fun games.
Our (goo's) idea is to make it easier for game developers to make web based games, so you don't have to be a web developer to get a great browser experience. Still quite early in the process, but I have a good feeling.
Game design is hard, so eventually we will have to converge on a series of design guidelines that make for great browser experiences and fun games.