Most of the guitar recordings sound extremely bright, when they are isolated in a mix. In my opinion, they sound best when they are bright, it's better for bass to do its job in a mix. Live tone, of course, is very different.
When I record guitars over some mix, I make sure that guitar sounds MUCH brighter than how I usually like it.
I think this also explains why Celestion Vintage 30s are some of the most frequently used recording speakers, but IMHO, they just sound weak in person.