It does indeed get pretty interesting, due to the team size scaling being pretty wonky. Unlike most other content in Champions, Adventure Packs and Comic Series both scale mobs to team size. But the scaling is way more than CoH. Like in CoH you went from 3 mobs to 5-6 mobs for two players. In Champions you get 7 or 8, and it only gets worse from there. What you get for 5 players is roughly equivalent to what CoH would throw at a full team of 8.