The two silent features I can watch anytime: Metropolis; and The General.
I love Metropolis for its being the stylistic pioneer of science fiction films: The impressionist sets, costumes and styles, imaginative cinematography, bold and thematic orchestral score and not-quite-three-dimensional characters became the veritable template for major SF films for decades.
The General is a personal favorite because of my love for Buster Keaton's work, and I've always considered The General his best.
You certainly have to put yourself in a different frame of mind to fully enjoy these old movies, both because of the historical differences in moviemaking, and of culture in general, compared to today. But I don't have a problem with that; in fact, I enjoy it more than watching most modern movies set as period pieces. I can watch silent comedies all day long.