Like most have said here, he can have a great match with anyone. Plus I think him along with Punk represent the opposite of what wrestling is today. They want longer, more technical matches, focus on the in ring product, and stop with the PG lame story telling. He's the underdog, not only with his character, but in real life as well. Most of us all wanted guys like Benoit, Eddie, Jericho, Malenko, Curt Henning, Dolph Ziggler etc to get to the top. Some have, some haven't but with guys like Bryan we know its a struggle for someone like him to get to the top position in WWE. We know he deserves it, we know WWE probably doesn't fell the same. That fact makes us want him to get there even more.
I also have a more personal connection to liking him. I watched him as American Dragon in ROH. I went to many shows in the NY area, and he impressed me every time. Wether he was wrestling a 5 foot 99 pound guys and making us all laugh with "no selling" everything (which we then jokingly yelled at him that he was breaking character and ruining the business… Dragon and the crowd laughed through that whole match) or if he was tearing the place down with Kenta, or Nigel Mcguiness he was constantly impressive in the ring. Adding new moves, changing his style, or doing his classic moves in a new way was a nightly thing for him. In the tradition of Benoit, Jericho, Bret Hart etc, I think Daniel Bryan is the best ring technician WWE has right now, but I firmly believe American Dragon (with no WWE filter) is the best wrestler in the world. So I think there is some hope from me that I'll get to see little bits of that every time I watch him.