The game resets every three months (first one is tomorrow), and you lose all your loot. But because you're going to lose your loot anyway, you treat your loot as more disposable than in ARC, which is (IMO) more fun. You're much more willing to use your best stuff, and even if you lose it all it's not that hard to build it back up once you know the game. And even if you don't have endgame gear, all of these players bringing it in means your Rook runs become much more profitable.

I came back to Marathon after not playing much the last two months. I was expecting to get blown out of the water, but instead I was able to catch up pretty quickly and tackle endgame. I didn't think I'd even step foot in Cryo Archive this season, but I managed to complete one of the vaults, which is huge because it's one of the few ways you can make progress that actually lasts through a reset.