It's a game where you spend hours and hours downloading and installing mods. Then you play for 15 minutes, figure out which are broken, delete them, and spend another few hours finding new mods to replace them. It's that addicting.
Every 3-4 months, you will have accumulated so many crappy mods that you will completely delete the game and re-install it to clear all the mods. Then you will go look for all the good mods you used to have, and in the process download lots of horrible mods.
Basically, it's a downloading game.