Wrestlemania 30 had;
Daniel Bryan vs HHH - The best match of the night and the best match of HHH's career
The only good ARMBAR Battle Royal and had a really memorable spot at the end
John Cena vs Bray Wyatt was a really good match
Taker's streak ending (which was still dumb, I think)
Daniel Bryan winning it all
That ARMBAR was boring. Battle Royals always are. They suck. Bray sucks too. And Taker/Lesnar was a bad match.
You're left with two good matches and Taker's streak ending which was long overdue. Not a bad Mania, but 31 was better.
This ain't the 90s anymore. Wrestlemania 17 changed the game. Wrestlemania 19 delivered too. Greatness has a bar. And since then Mania is trying, and failing. But I think that has more to do with the length of the show now. It's just too long. If they kept it a tight 4 hours, they'd instantly improve the show.
Someone needs to tell Triple H that he only has 15 minutes for his match. Dude really takes the piss. His matches don't justify the length.