I love the mutliplayer as well, even if it is repetitive and a few parts reek of poor design. Mostly the upgrade system based on Fake Longevity, the balance of classes, and uselessness of a lot of weapons. Still, if you know some people online, or even if you don't, it's a lot of great fun and provides a rather good challenge on the Gold difficulties. And just like in the core game, the weapons and classes are interesting and diverse.

I think the biggest problem might actually be that it makes single player harder to enjoy. I mean besides the fact that multiplayer has several features that singleplayer doesn't (armor modules, rail amps, headshot V Is, shield boosting cells, purchasable ammo, unique melee attacks, passive bonuses, and dashes for races, the DLC guns, etc.), it overall just makes single player feel so easy and underwhelming. Killing six brutes, two banshees, and a couple dozen Marauders on the final battle on Earth seems a hell of a lot less impressive when you and your team do that and more every round on Gold, plus a bazillion Cannibals and generous amounts of Ravagers.