Metal will be a competitor or alternative to DirectX (hopefully, eventually), but there's simply no software for it yet. If you want to run current games, they're all written for DirectX and/or OpenGL. And the mac OpenGL implementation is pretty poor in terms of game performance.
Metal will not speed up anything currently out there unless the games are patched/re-written for Metal.
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It's not just the rebooting. It's the additional disk space, and the fact that i'm installing a copy of Windows at all.
Every time i'd reboot into it (sometimes not for weeks/months), it would want to do a heap of windows updates, steam updates, etc.
Running games in the OS you boot into every day is far more convenient.