I think Construct 2 HTML5 & GM HTML5 are a big fail!
HTML5 WEBGL:
<img src="http://expert.com.ua/wp-content/uploads/2010/04/quake-html5.jpg" border="0" />
Flahs UE3:
<img src="http://vl.kamibu.com/wp-content/uploads/2011/01/flash3d.png" border="0" />
UnityFlash:
<img src="http://www.uraldev.ru/files/news/2011/09/Unity_engine1.jpg" border="0" />
IMHO