In the grand scheme of things, Reigns been getting okay reactions. He hasn't been getting booed out of the building as some were expecting and/or, unfortunately, even hoping, but they haven't been going wild over him either.
As has been mentioned, it's not uncommon for more "smart" fans to go to TV tapings and pay-per-view events than to house shows. That's not to say that no or very few "smart" fans don't go to house shows, because they do, but what happens at house shows in WWE, and the vast majority of wrestling promotions for that matter if they have TV deals, often has little to no effect on the storylines and feuds we see on TV each week.
Now the "dweebs" who aren't cheering for Roman Reigns aren't just fans of Daniel Bryan. A good number of them just aren't into Reigns because they feel they haven't been given any real reason to get into him. Vince picked him and the fact that he has the general formula, i.e. a great physical look, are the only reasons some feel that he's been given the push. I'm not the biggest Reigns detractor, but I'm not his biggest supporter either. I think he can POSSIBLY be what Vince seems to hope he can be, but I don't believe he's at that level right now or really even close to it. I think he's done okay in the grand scheme of things but, in my eyes, but just doing okay in what's supposed to be THE top match at the biggest show of the year isn't good enough. To be fair though, it's not as though the build for this match has been anything resembling spectacular and that's management's fault because talent can only work with what they're given.
I think some fans view Reigns as someone that's being almost forced upon them despite the fact that there are other babyfaces on the roster who're more experienced, more charismatic, more skilled inside the ring and more over with the audience overall than Reigns. I think the backlash is more against Vince than against Reigns because he's much too close to the formula that Vince himself prefers, a formula that seems to be growing more & more out of touch with the tastes of modern wrestling fans with each passing year.