Harmy said:

No, it certainly wasn't - the monkeys looked so terribly fake, I had a hard time watching the otherwise pretty good movie.

And yeah, the GotG CGI characters were pretty good but they are kind of cartoony by their nature, so that helps a lot (alongside the great story of course).

They didn't bother me at all. They look fake sure, but not anymore fake than people dressed as apes. To me, it's either fake looking apes played by humans and costumes, or fake looking computer apes. At least the apes in the new movies can move around like apes because of the CGI.