This is a dream match. Two larger than life stars in a battle of generations. Sure it will be finisher and kickout heavy, but isn't every big match these days? Many will disagree, but Reigns deserves another WrestleMania moment. He's been out of the main event scene for a year. (Nope I'm not counting his feud with Corbin)
Now this really didn't need the championship, and there was literally no build. Saying catchphrases and pointing to a sign is a bad build for a B-PPV two weeks after a PPV in Saudi Arabia, much less a WrestleMania world championship match.
The current WrestleMania card is great, but Reigns vs Goldberg in a non-title match and Cena going for #17 against the evil murderous Fiend he helped create would've been even better. Oh well.