The hardest part about Legendary is how disproportionately stupid your allies' AI is compared to the enemies. It's so hard to go from Mass Effect where you can just press a couple buttons and your allies are covering you, to this, where your shitty partner says "He's yours, take him out... quietly." Then proceeds to jump out of his own ****ing hiding spot and fire wildly with his sniper rifle, missing every shot (because only the enemy AI has good aim, mind you), while I get lit up like a ****ing christmas tree because I was trying to be sneaky. Or how if we're getting torn up by elites I'll try to circle around their side using sprint and flank them while they're firing at him, which of course fails because the stupid mother****er follows me across the battlefield, even if it means getting shot 50 times.