I'm wondering how to tell the difference between bad and good acoustic with electric capable guitars?
well as a general rule, the more solid wood the guitar has... the better the quality. if the description of the guitar doesn't specifically say "solid spruce top" or "solid rosewood back" then it isn't solid.

there are obviously certain brands that have made good names for themselves... i.e. martin, taylor, larrivee, breedlove, alvarez, takamine, yamaha

other than that it's really just all about what sounds good to your ear!