Terrible builds:
AIU without Tactical Cloak
Justicar without Reave
Volus without Shield Boost
Terrible loadouts:
I joined a lobby (Reaper/Gold) with 3 biotic kits and each one was using Disruptor Ammo I.
I won't even mention the Fury with Harrier&Reegar anymore...
Terrible playstyle:
Joined a lobby (Reaper/Rio/Gold), the host was a Volus Protector with a Predator IX and Barrage Upgrade II or something like that. No consumables. There was a Drell Assassin in the lobby and I was playing my Fury, so I thought: Hey, even if the host is useless, the two of us can still win this without a problem.
The Volus was pestering us about the "Box Method", which was unfamiliar to me... and I really saw no reason for it since we finished the waves quickly without a problem. But since the Volus and another player kept hanging out at one end of the map, I moved over to them and have a look. They stood in a tiny box for the entire game, not contributing anything. The Volus had 20k score in the end. Oo
After the match he asked "Want to do it again?" and since I was busy in the store, changing kits to Geth Trooper (Flamer build) and equipping consumables, I didn't notice he changed to Platinum. The Drell Assassin must have left, to be replaced with a Juggernaut... and the 4th player switched to Juggernaut, too. I only realized this during the first wave, when they all moved into the box.
Now, I don't think using this method is necessary, but it might be good to know in case you need a safespot sometime. But the Juggernauts and the Volus didn't know that Juggernauts are immune to sync kills anyway.
So we're all crammed into the box. I'm stuck in a corner because there's a Juggernaut blocking me in. Both of them have the huge Hex Shield and both place it -inside- the box. Outside there are tons of mobs piling up... but I can only hit Juggernauts or the shields. It takes forever to kill anything and each time I remove the pesky shields with my Acolyte, they replace it.
I tried to explain that the Juggernauts need to move out, that their shields make the entire match freaking slow and that the Volus needs to shut up about "get in the box, get in the box, you'll get killed out there!"... but ME3 doesn't recognize me speaking even with Push to Talk active and the microphone set to 100%.
I pretty much spent the 30min until the inevitable wipe in wave 10 raging at 3 morons who didn't hear me. Btw... guess who had to do objectives on his own because the Juggernauts didn't leave the box?
Seriously... until last night I didn't understand the hate for Puggernauts... now I do. When I play Juggernaut, I am soooooo much better and I'm not even "best of the best" .