After going through a few of those examples, the performance really isn't that good. For example, in Chrome my computer struggles to run "The Isle of Yosemite"

After going through a few of those examples, the performance really isn't that good. For example, in Chrome my computer struggles to run "The Isle of Yosemite" in 1650x1050 at 30fps when looking at a fair bit of geometry. Yet I can easily play Battlefield 3 or Natural Selection 2 at 30fps, and the gulf in image quality, how much is in a given scene, and how much game logic there is is enormous. Thus far, HTML5 games seem more like a replacement for basic 3D flash games more than anything. Whether that will change at some point in the future I don't know, but at this point I have not really been wowed by anything.