Do you think La La Land could have been better if the voices were stronger? I feel the same way you do, they weren't really that great. I thought the story was ok, but I didn't really see why so many people were proclaiming it to be one of the best films they've ever seen.
It would have been an improvement, but it just doesn’t do anything new in my opinion. The cinematography was stunning, and really was the best part of the film. But the story isn’t all that interesting, it was a story about artists in LA who are all white for some reason?, and it’s the white guy trying to save jazz… just so many issues. It doesn’t recognize the diversity that makes LA so incredible, and the singing and dancing was so mediocre from the leads that it left me feeling disenchanted. The featured performers in the first two numbers? Unbelievable, engaging, diverse, and so skilled. If the movie had been filled with actors more like that, maybe I could have been more on board.
Overall, I think the movie was just okay. Not horrible, but certainly not the best movie ever made.