The Shield has dramatically improved IMO and I was one of their harshest critics. I don't see the Reigns hype, I think he is the all around worst of the three, but Vince loves a big brute force. Ambrose was always good on the mic, but he's become great. He still can't sell a beating. He has more Cena bounce back from anything juice than Cena does at this point. He's horrible when he's covered too. Just awful. Rollins can fly with the best of them and has developed a few moves, but he could use some all around polish, especially on the mic. If that split happens, I'm afraid he'll be buried. I'm still not completely sold on them, but if they continue to develop, they will be fun to watch. Just not sure they will be as great divided.
As for Bryan, this a career making move. He might turn the Wyatts into anti-heroes, or he's a villian for awhile and makes a face turn at a key event (I would imagine this has to last longer than three months so I'll say SS. To really sell it, he does something AWFUL to please Bray at WM then makes the face turn as SS) that brings him to the top spotlight.