I love Riviera, I think it’s the best Epcot resort. It isn’t the best at anything, but as a whole, it’s got no disqualifying negatives in my opinion.
It has subtle theming. Of course it isn’t the Poly, but the Poly doesn’t have 1/2 brs. It has great restaurants. Not as many good options as VGF, but Topolino’s and Primo are the best in the bubble for TS/QS. It isn’t walkable to HS or Epcot, but the Skyliner is almost as good. It’s not as sprawling as some resorts, but I don’t have to get rained on or walk 10 minutes to get food or coffee. The rooms are the nicest appointed rooms on property, even people who don’t like the resort can’t deny that. Lobbies are nice, and it does have a rather unimpressive one, but not the worst.
In my eyes it scores a solid 7-8 in every category, maybe a 9 in food, so it’s not the best in any particular but the best Epcot overall and 2nd of all overall in my opinion. Opinions differ.