I didn't see anything horrible being said about the development for browsers. The problems were mostly XNA functionalities that he hadn't implemented in his XNA to html5 converter.
These kinds of sprite based games have been around for decades and used to be developed on hardware orders of magnitude less powerful. The fact that such a thing would ever have performance problems on modern hardware is a joke and shows how backwards web development is.
I like to think that web development with all these new "features" enable people a nice playground to get hooked. While I'm disappointed that the there is no easy "mode 13" to get started with fun graphics programming, I'm optimistic that a platform is getting built that enables people to iterate on making things fun that will then drive people to go deeper in the stack.
