It's very rare that I rent or buy a horror movie and actually end up liking it. Revenge of the Rats has proven to be the exception. It's foreign, German in fact, and some of the dubbing is a bit odd, but it's not bad. Really the only thing I didn't like was the utterly predictable part with the dog; a little girl loses her dog in a tunnel full of killer rats, and the damn thing miraculously turns up alive at the end of the movie.
The movie is set in Frankfurt, where there has been a garbage strike during a record heat wave. The city has become infested with rats. Not just ordinary rats, either. These rats carry a mutant strain of meningitis and become vicious whenever anyone tries to clean the city. I liked this a lot. It's actually worth more than the $5 I paid for it.
If for some reason you wanted to look this movie up in the IMDB, it's listed under its German title, Ratten - sie werden dich kriegen! I'm not sure why it isn't listed under it's English title as well, but it isn't. Anyway, I liked this move a lot. I give it four and a half yos.