The only problem with wiziwig is that quality suffers horrendously. Sometimes you get lucky and find an HD stream, but usually the bit rate is really low and looks like you're watching a VCR tape. Most games are broadcast via flash media.
As mentioned, i use chromecast to get my browser to the TV. With the new Macbook i just got i can stream any tab or browser window in 720p to my tv with no lag or stutter. You don't need a mac for this, just something with good specs as its pretty process intensive when streaming your entire browser rather than just a youtube video or some other supported media player.
If i could figure out how to get sop cast and ace streams running i could get ANY game in HD via p2p streaming.