I also use the VLC desktop app. I started using it to play MKV's, and it does a super job with these and any other format I've tried thus far.
As for a VLC metro app, I believe they are working on one, but it's not arrived@ the store yet.
The ones in the store now that use the name VLC, are not the real deal. Not saying they're all no good, but I'd probably not waste my money on one.