This is one of the best Discovery Channel shows still running, right next to Mythbusters. Basically, the name of the show summarizes it perfectly. It's about Mike Rowe, deciding to do some dirty jobs that make civilized life possible for the rest of us.
First of all, this show is quite funny. Mike always has something funny to say, and the dirtiness adds to it. I may sound immature, but this makes dirtiness funny.
This is also informative. It teaches you how your lobster are caught, how your septic tanks are cleaned, how bugs are exterminated, how roadkill doesn't litter our highways. While it may be gross, you now know how all that stuff is done.
Eh, this is a rather short review, but I'll just wrap it up saying that this is a cool show. It's funny and informative. I look forward to watching more of it.