Rock 'n Roll High school is the absolute opposite of a serious and mentally enriching punk flick, but it's probably my favorite comedy of all time. Set up like a standard "teen movie" with stereotype characters that behave in predictable, yet entertaining patterns, the movie doesn't take itself seriously, so you'd be silly to try. The scenes with the Ramones are great too, the band themselves don't have a lot of lines (the included booklet talks about how uncomfortable they were with the acting portion, so it's probably for the best), but the live scenes are well directed, and the plot bits they do take part in are fabulous.
I enjoyed the commentary track a lot too, the movie was shot in less than three weeks on the smallest budget possible, so there's obviously a lot of fun stories on how they managed to put everything together on such tight constraints, and still have a great time doing it.
Rock'n Roll High School is by no means the greatest movie ever made or anything of that class, but that doesn't take away from the fact that its just plain fun to watch, and re-watch. Get it and have some fun.