All of Serkis’s work Gollum, Kong, Caesar - is never 100% perfect (maybe the last Apes movie) but it’s perfectly believable in terms of characterisation. That’s why Gollum holds up over 10 years later, the CGI isn’t that good today, it’s aged. But the personality, and performance makes it work.
Rogue One on the other hand is poor, and it’s made poorer because the surrounding story doesn’t support the inclusion of these creepy death masks. I wanted to see Krennick and Galen, that relationship. Or Jyn and Saw, that relationship. These are things that matter inside the plot, but we don’t get them. Instead, all that money wasted on pointless visuals.