I really think having Show/Kane just generically throw everyone out was what made the Royal Rumble pretty bad.
They trivialized the 40+ minutes of Bray, had Ziggler make 0 impact, and magically were able to throw out everyone except for Reigns. I think that if they had the final few (Ziggler, Wyatt, Ambrose, Cesaro, Kane, Reigns) legitimately battle things out, it wouldn't have been so bad.
I think a lot of anti-climactic and premature eliminations really hurt things. Bubba Ray and his face-offs with some of the company's top brawlers was pretty awesome, then they just kind of tossed him out before more confrontations could happen.
Another thing that really bothers me about the Rumble is that it completely negates the previous storytelling.
Daniel Bryan, Dolph Ziggler and Ryback all overcame the odds and earned their spots in the Rumble, only for every single one of them to get tossed out in the most anti-climactic way possible.
I'm almost ok with Reigns winning, but I really wish that WWE would've taken a real chance on someone like Wyatt or Ambrose and giving them the nod, I think they're more big time ready than Reigns is at this point. Reigns really needs to work on his promo skills and refine his in-ring work before they shine the spotlight on him too much.