I'd say yes.

As a big Star Wars fan, I felt Rogue One was just a pretty average movie until the final act where I felt like I finally got what I came for. Rewatching it last night only made me realize this more that the movie is average at best until the finale. I always felt the same way about Attack of the Clones growing up too. That movie pretty much sucks until the last 40 minutes.

But it's hard to say that an ending ever does more than just make up for what came before. By that I mean, it doesn't really turn a bad movie into a great one just because the ending was so insanely great. If the movie still didn't do its job well enough in the first two acts, I'm still going to label it as just an adequate film, regardless of how amazing the final act is. Same can be said if vise versa. I've seen movies that were AMAZING until the final act, and then the ending kinda ruined it. I would then label the entire movie as being bad, I'd just tell people the ending sucked. But many times a bad ending does have a correlation with whether or not I decide to ever sit through the movie again on repeat if I know whatever I'm watching will just lead to disappointment.