I picked this up a while ago, I've been meaning to get back to it and see about writing a review.
I loved, totally, the first two movies (and I've seen the first two VHS tapes of the TV Series and loved that too)...
The 3rd movie I wasn't thrilled with, but I think most of that had to do with what it wasn't rather than what it was. You see I've become somewhat attached to the main characters from the rest of the series, where this movie is mostly just set in the Patlabor universe.
I have to watch it again, but I remember thinking that the R rating was a bit over the top for the movie, while it has some gore/violence, it's not too bad (not nearly Akira level) and I don't remember the language being all that bad either, however I could be just that numb to it at this point that I missed it.
Basically the movie is a Giant Monster Romp on Tokyo, the kind that starts out with "what's been attacking here?" type of stuff and ending with... well, you know how these work. Think Godzilla... that nice American version with the kid from WarGames
(only with less buidlings getting smashed).
It really wasn't a terrible movie, but where it failed was that it really isn't a Patlabor movie. They should have pushed the "Wasted Thirteen" more and dropped the Patlabor from the title.
Just my humble 2cents worth.
PHIL