<< Too much strumming, not enough fret work. >>
I'd suggest looking into his style of guitar playing. The fret is getting quite a workout to have his sound.
To those that never understood the fascination with following a band, here is a word about that. If you haven't done multiple shows or an entire tour before, you probably don't understand what the fascination is. But, with Grateful Dead, Phish, Widespread, Cheese, etc., there is a whole other world happening around these bands. The guys that travel for an entire tour live on the road with one another. You get to the next parking lot and walk around and find your friends. You sell some goods, food, or whatever to make ends meet and get gas money for the next town. Each day you wake up in a world where there is an economy system created by you for yourself. It's a challenge and a joy to make the next city and get tickets. And, at 8:30, all the days work pays off when you're out on the lawn (or in your seats) surrounded by 5 to 10 thousands friends you've made on the road. You know everyone there has the same appreciate for the art created on stage each and every night. These are the fans that listen to a song each night and pick out what is different and how they progressed differently to a completely different jam or some obscure musical reference. Playing Warehouse for 10 minutes each night is what art is for these bands. Dave Matthews falls in there, but he's also got an incredible commercial enterprise going. He's been playing the same way for the last 8 years. Someone mentioned why does every song turn into a 10 minute noodle-fest? Because that is the art he creates. The song is different every night, whether the average ear can hear it or not. But, the fans following each show can hear the difference and it's what makes them happy. You get off on following your favorite songs to new places and hearing the jam as it is created and following with your closest friends that understand it like no one else.
Dave Matthews falls into the realm of jambands and it's different than other music. It's not Britney Spears here, they don't punch play on the CD player and then hit the stage to lip sync. These guys create art each night through improvisational jamming and exploration. It really is a different world on tour, but it's not for everyone.
If you aren't a fan of Dave, then I wouldn't suggest going. If you don't like his 10 minute jams then don't go so see him. He's been doing that ever since he began. He's not changing, or so I've read. I personally haven't seen a Dave show in 4 years, since prices got out of the $20-$30 range. Before that, I saw close to 25 shows from 400 capacity clubs to a 20,000 seat arena. It was great everytime. He knows his music and creates it on stage each night with everyone else in the band.
But, it's not for everyone. Touring is not for everyone. But, saying he sucks or that the band sucks is pretty asanine. I don't think I'd say Backstreet Boys suck, but you'd never catch me listening to it. You have to learn to appreciate that everyone likes different stuff.
All you suckers just don't have any taste/appreciation. 
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