I liked the Watchmen movie as well and no problem with this actor.
I wouldn't mind a slightly CGI Superman in that they use motion capture and the CGI kind of augments the costume. In the comics, they can use shadow and texture that do not appear in the movies. So CGI could be used to make the muscles stand out or be more defined. Even Reeve and Routh lost their muscles with that big suit on. They had the bulk, just not the definition if that makes sense.