I want to preface this by saying I don't hate Roman Reigns. I even sympathize with him. He will eventually be a big star if he is allowed to grow organically.
That being said, I don't like that they've given him character traits that suit Dean Ambrose's face character best. The whole lone wolf, one versus all, coming from out of nowhere, smiles bloodily when he gets his rear kicked... I feel like they all fit Dean's Lunatic character a lot more.
I also don't like that he seems to constantly need Roman Reigns' help in this EC build-up. Objectively, if you look at what's portrayed on the storyline, Dean would NOT have his title opportunity at EC if Roman hadn't helped him time and time again.
While friendship is great, and SHIELD reunion nods are great (even if premature), this doesn't feel like a two-way street. Reigns would never NEED Ambrose's help, in fact in his WM build-up he was portrayed exactly like a lone wolf type.
But it looks like the writers/bookers/Vince feel like 1) Dean Ambrose is not believable in that role, he couldn't stand up to the authority and get out on top by himself and 2) Roman Reigns needs to stay popular and relevant in the main event while we figure out what to do with him next. (note that Randy has been off tv since Payback)
So in the end, I sort of resent that Dean Ambrose is being anchored down by being dependent on Roman Reigns' help. Dean has been the most entertaining he's been in ages (ever since bizarre hologram/exploding monitor losses and THE STREAK of PPV losses have hurt the character's credibility). I really feel like he could be almost Stone Cold-ish if only he'd be allowed to go alone against the Authority and still, somehow come out on top.
I mean in Raw when he came out with the Cop suit and the batons you could justifiably have him go over the Authority for one segment: he had the element of surprise! He had equalizers!
Anyway, looking forward to another chapter in Rollins/Ambrose and hopefully (eventually) the WWEWHC Shield triple threat we all want.