What exactly makes for good team content?

3 things that make for good team content
and 3 things that good team content does not have

Arbitrarily limiting it to 3 of each so that you choose important ones rather than a laundry list of everything you can think of. Of course there are more, but a big list becomes meaningless.

Have
1. Variety of foes. This should be in the mission and between missions. CoT at some levels each spawn feels like a different group. Warriors every spawn is basically the same. A series of warrior missions is nap time.

2. Variety of map areas. Both between missions and in the mission. The terrain makes a big difference in a fight and variety is needed.

3. Elite Bosses or AV's. Bosses show up almost every spawn in a team and just become another speedbump. You often have no idea you took out the named guy at the end because the fight was no harder or different than any other.

Not Have
1. Non-combat missions. Teams break up fast when the leader has to do some running around while you wait.

2. Stacking de-buffs. When a spawn has 12 guys that can put on -rech the game slows to a crawl, or -to hit, or other debuffs. Given the number of foes in a large team stacking debuffs can quickly become stupid.

3. Allies. Allies are great in solo missions to change things up. In teams they die really fast or make you move really slowly (or the team splits). And they don't add much when you already have a bunch of characters together.