I'll say this, if it's a decent ax in excellent condition - pretty well everything can be tweaked to make it a great player. Whether it be different tuners, a new nut, tone-pros bridge, different pups, good neck set up, etc. all these things are variables that can - if need be - be altered to get the guitar to where it should be, if it needs that to actually get there. Sometimes you can get one straight out of the box that's just killer.
Interesting story about Jim and Janine at Route66. It's VERY rare for another player to look for the exact same (or almost all the same) variables in a guitar. Well, just so happens "Jim" and I dig the same feel of a guitar - we recognize the same playability aspects - we like the same action and feel the same about resonance. So man, I've been so lucky as he'll send over an email with "another total winner" in the subject line and sure enough - it's a total trophy right out of the case. In this regard, I've been lucky. But of the ones I've bought off the net, there's only been two I simply couldn't work with and had to dump. Of the others, over 16 in total, I've brought them back to being awesome players, and of the ones that were god-like - I simply kept them :lol
Don't be scared - in their simplest form, they're wood with some electronics in them. Make sure they're true and straight and the frets don't need a re-dress (or complete re-fret) and you're good to go.
Good luck!!! If all else fails, there's always PRS
Mo