Feynman means
A LOT to me. I don't know much about string theory, except what Feynman has to say about it, and I can sort of see his point.
Basically, he said that he doesn't like String Theory because there isn't enough computation in it. He said it explains known facts, but it doesn't calculate much. So whenever a result comes out that doesn't agree with current String Theory, they "patch it up", by adding some additional part of the theory. This is what he doesn't like. When you compare this to something like
QED which calculates very precise phenomenon that happens to agree with the real world to 10 significant figures...
However, he died a while ago, so I'm not sure how much it's developed nowadays. Btw, I am not a science nerd, and didn't think you were either! :wink: