Wow. I just finished watching this, and when I log on I see this thread.
I liked the film for two reasons: I love heretical satire and I love a train wreck. This film is both, and it doesn't pretend otherwise. It is a festival of glorious awfulness. That said, it is hard to watch at times because of the many, many grossouts, the worst (for me) being Harry's first conversation with the fly. Yerch, I could have lived a long and happy life without seeing that. However, much worse is the bad puppetry. Many of the puppets twitch and flail instead of moving purposefully, and the lip-synch is often dreadful. That kind of thing drives me up the wall!
...I wonder if there's a soundtrack available? I'd pay for clean, non-sound-effect-filled versions of "Garden of Love" and, er, Sebastian's song.