I usually just avoid it early game, until i get some hardcounters. Just work your way around it, and if he overextends you'll have a good chance at killing it.
I really appreciate all the advice given here, but I haven't recived any real solution to the particular rush i encountered in this replay(?). The problem is that my first riflemensquad got suppresed before they even managed to cross the bridge. I guess i could send my engineer squad over right away, but that gives me delayed fuel, and that will put me behind if my opponent decides not to rush... hmm..