Underrated for what it is - a movie.
I can't believe all the freaking out about how corny it was and of course "but the real Patch Adams didn't like it!".
Boo freaking hoo. It was a movie done for entertainment and, if you have even a tiny piece of non-cynical heart left, left you with a little bit of a "feel good" feeling. Maybe it made you want to help people, or possibly at the very least, just be a bit nicer to people overall in your day to day interactions.
Yeah, it was sappy and over the top. No, it wasn't the greatest movie ever made. And no, supposedly it's not incredibly accurate as far as the "real" story is concerned. Who cares. Repeat after me: It's a movie. Personally, I was entertained.