Agreed, Keaton was really good. In fact, I'd rate him higher than Chaplin, which is nearly heresy in some circles. Chaplin was good too, but he was sort of a caricature of the character he had created before long. I also do like Valentino, and Clara Bow ("The It girl" as she was often known.)

Acting in the silents required the skill of a meme. It had to be much more difficult than what we think of as acting today.