I can't really put my finger on it(might as well try), but it didn't really have a five star feel to it at all IMO. The finish was completely underwhelming, besides an FU, there was hardly any near falls and the finish, although the move is awesome, didn't work that well in the circumstances. They should have introduced that finisher a few weeks ago so the finish looked less awkward IMO. I'm all for non-finishers winning matches but it didn't work well in this instance. Cena was pretty poor throughout IMO, his spot calling was ridiculously loud, he (possibly Bryan as well) also botched a scripted bit which they had to awkwardly get back into.
On a slightly random note I was also slightly disappointed with the lack of work on Cena's elbow.
4 stars tops for me, Bryan pulled off some great shit (the triple Germans into the bridge pin, the proper execution of the STF, the superplex) but there was a few things I found wrong with the match. Little bit underwhelmed with it tbh.