Pretty much this. I will add ... 4) Is the intonation good, and if not, can it be set up to play in tune? Not all guitars can. 5) How does it look? There are some guitars that are either just not to my liking or not the look I want for the purpose. I'm not going to buy a neon pink, double locking, Floyd Rose shred metal axe to play jazz on, even if it is the best sounding jazz guitar there ever was. That said, I would absolutely rock a jazz guitar for metal.