MTG

I like Commander.

I'm not the first to say this, but it is definitely unfortunate that Commander has become a lot of people's introduction to Magic - it is strategically incredibly complicated, takes a long time to understand if you don't know all the staple cards, the meta and unspoken rules are completely socially dependent, and there's lots of politics - these are all really difficult for players who are new to Magic or a game store or a social group.

That being said, I think Commander is the most fun format for established players who have a consistent playgroup that creates an ongoing culture. The options are limitless, really, so everyone can express themselves through deck construction. The other way I've really loved Commander is in explicitly competitive formats, like budget leagues or tournaments with set-in-stone rules. If the rules are known up front then everyone knows that LD, Stax, or combos are on the table and salt is just clearly bad sportsmanship. You can't really avoid poor sports in any game, unfortunately.