I evaluate players totally differently depending on what I need them for. For studio work, or for live touring band, or for just pleasure of listening.

The ability to make others seem to sound better than they actually are is key in my work as a studio guy. Can I (or a musician I hire) play a supporting role that actually enhances the perceived ability of the client in the studio?

Gigging: Are they reliable, are they friendly, can they learn fast and accurately? Ironically enough, keyboard players have been my worst problem when it comes to gigging. Just haven't found one I really like. Of course, most of my shows are solo or duet gigs; not many with a full band.

Personally, I do gravitate toward musicians who are masters of their instrument. I'm into technical expertese. Equally as important is creativity. Have they come up with something unique; doesn't have to be ground-breaking, but a reason to listen to them that is unique to them. Brad Paisley is unique, and incredibly gifted on his guitar as well, which would explain why he's my current favorite country artist.