So, over a half year in and let's see where we are:
Cesaro - Completely fell off a cliff. Doesn't even have match at Summerslam.
Wyatt - Feuding with Jericho, but, IMO, the character is getting a bit stale. Recently got a "what" heckle from fans during a promo.
Rollins - Feuding with Ambrose, aligned with HHH, but hasn't really taken off since the Shield breakup.
Reigns - Still on course to be the man, but still hasn't shown mic skills good enough to shut up detractors. My guess is that Vince is having second thoughts.
Ambrose - IMO, the most over of the group. The fans have really bought into what he's doing both in the ring and on the mic.