I'm a firm believer that some "creatives" only have one or two _____ (songs, movies, paintings etc) in them and they can make a good career recycling those one or two good ideas.
Apatow is one of them probably. Guy Ritchie is DEFINITELY one of them (just stick to remaking Snatch in various incarnations). As a band, Social Distortion is also in this ilk (Mike Ness basically writes 3 songs over and over again with good result)
I dont mind it. I would encourage it. Not everyone has range, and some creatives are at their best within >this much< range. Of course at some point they usually feel they are more talented than they actually are and try to broaden their range, usually with disastrous results, and go back to what they do best.