The guy can’t sing (phrasing, anyone?) He can’t write songs. And while I’ve heard guitarists defend him, I’ve personally never seen or heard him play anything that strikes me as being more than sort of marginally competent.
I would ask you to explain to me what the big deal is, but I’m afraid you’d try. So here’s a song by Dave Matthews, and the less said about it the better. I don’t necessarily recommend that you listen to it.