I found Tetsuo to be kind of obnoxious. Back in the day I had an unsubtitled copy of it along with some naughty tentacle anime on a video tape and would show it to people at parties... but when I finally found the domestic cut, it turned out that the subtitled version didn't make much more sense than the Japanese language version. There seemed to be a healthy underground film scene at he time Tetsuo was made with movies like Pinnochio 964, Death Powder, Crazy Thunder Road... and unfortunately, not many of them are any good. Pinnochio is good for a laugh, at least.
So that was my first experience with Shinya Tsukamoto. I DO like a few of his movies, though. I loved Bullet Ballet and Tokyo Fist. They're great.