Originally posted by Lucius
There are... worse characters to have difficulty against. I wouldn't call this very much of a black mark.
Seeing as how he couldn't overpower Revan with uncharged lightning while on a dark side nexus, whereas Sidious could push Yoda's tutanimus to its limits on neutral territory, I think it's pretty damning. And there are plenty of quotes that suggest Yoda > any previous Jedi (which would include Revan).