The comedy plays for sure a big part, but it's not pure comedy. Perhaps a better description would be "A crime family drama with a funny angle" or something like that...

But yeah, the funny moments are big part of the show's nature. It's no surprise that the most loved episode is "Pine Barrens" - which so happens to be the funniest as well.

Not that there's anything wrong with that. There's a good portion of drama and a good portion of comedy. It's that fine mix which makes the series so memorable.