Comedy? Probably. Comedy films? Not necessarily. You can laugh at Scary Movie 4 all you want, but it's still a terrible movie.

Definitely so. Apparently, Mystery Men is supposed to be funny.

Comedy is highly subjective, and is informed by cultural norms as well as much as taste. People from different countries and continents will find humour in different things. The Koreans for instance, seem to love visual humour and often have people slapping each other, something that may be frowned upon and considered distinctly unfunny by a society on the other side of the world. The Chinese taste for humour is often based around language, so if you don't understand the pun then you won't find it funny.

Whether something is funny or not is also affected by age and generation, such that I don't find Charlie Chaplin funny in the slightest, nor the Three Stooges... but equally my grandmother is unlikely to laugh during Spaceballs or at the typical lowest common denominator fart jokes in contemporary 'comedy' films.

I thought that too.

Once.