I play guitar and have a really nice Taylor as well as a decent studio with a Rode NT-2A condenser mic..... and there are times where I will simply use the Real Band real tracks guitars because they are so well done...and it doesn't require me to set up the mic and play the guitar.

It's very hard to tell the real tracks from the live guitar. I will use the live guitar often and especially if I have some picked fills or intros. Mostly I use live guitar because I can play it and then I can truthfully say that I'm playing the guitar parts.

By all means, dig in and use them. You will never go back to midi guitar tracks again.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.