Games that give you allies that are supposed to help at combat but only make it worse.
Elaboration: I doing a mission in Spiral Knights. In it, you have to rescue two fellow knights who are being held captive. When you free them, they fight by your side. However, not only do they do very little damage, but they also use an attack that pushes enemies away. You want to know why their knockback aggravates me? When they're not sending an attacking Demonic Spider enemy at me with an attack, they're sending an enemy that I was trying to kill away from me. They also, being AI, don't have the knowledge of tactics. The aforementioned Demonic Spiders hit hard, are small, and dodge the already-slow moving bullets I shoot at a ridiculous speed, not to mention that they can get a power-up from one of their allies that refills their health, gives them an even harder-hitting attack, and makes them jumpier than Columbus. That switch that operates the gate that's separating the enemies so they're easier to handle? You can be sure that in pursuing their primary goal of smacking enemies with the pointy sticks they call swords, they're gonna hit that switch and let the enemies mingle. They're also gonna hit the block that destroy all connecting blocks that was put there so you could fight one group at a time before attacking the next because the one behind a wall was CLOSER than the one that wasn't. They send the Demonic Spiders into the ones that give said DSs power-ups with their knockback attack. And worst of all, they can't even hold aggro very well. They only serve to make the game harder.