If SHAUN OF THE DEAD rates as a comedy, then so does REANIMATOR. Gross and icky and funny.
A number of comedies on these lists were dismissed as trash when they came out, now regarded as classics. ANIMAL HOUSE. Mel Brooks, CLERKS. OFFICE SPACE. BETTER OFF DEAD. --the last one was panned by Siskel and Ebert, so I had to see it. They hated it.
FREDDY GOT FINGERED is considered odious by many, and just might be one of those movies wherein the person's taste just might veer in a direction you don't care for.
DUMB AND DUMBER certainly is hard to watch after seeing it thrice, and gets less enjoyable. It's a good collection of bits.
CHRISTMAS STORY anyone? This got panned when it came out. I guess critics were reviewing the director's resume' which included CHILDREN SHOULDN'T PLAY WITH DEAD THINGS and PORKY'S and BLACK CHRISTMAS.