I swear to god always sunny is probably one of the funniest shows on tv. I've probably watched each season like 20x throughout the years. Season 1 is not bad just above average but they get so much better
The first seasons was just a bit weird, it's more of like a stererotypical edgy sitcom but they bring in Danny Devito as a character in season 2 and it gets much funnier. By season 3 they really start to get into what makes the show absolutely hilarious and s4-10 are all fucking incredible.
Just watch an episode like the gang solves the gas crisis, The Nightman Cometh, franks little beauties, the gang buys a boat, or the dennis system and see if you like it. Those are basically the best of the show and showcase the tone of the show.