Metro fails to be an easy to handle UI, apple is much better than that. But they just started and 8.1 improved a lot of the 8 failures, i guess the ui will further improve in the next years.
There is a way to include the start button in win8. Just google it, it'll pop up somewhere. I can't say anything about gaming performance as I only have it on my laptop, but it seems to be a bit more resource efficient than win7.