When playing with others, it's comparable to programming with others. It's about communication, people will try to optimize stuff that already works, people will argue about how to build stuff or when to refactor stuff. Sometimes they will build something in a weird way and argue why this is the best way etc.
It can be a nightmare with the wrong people or a lot of fun with intelligent people who can control their emotions.
Also, the community is amazing and there are tons of mods.