No. Most of the ships aren't suited for Scenarios, due to the Tier level, and requirements, of said Scenarios. Only 1 T5 has decent AA, Texas, there are massive numbers of aircraft in Scenarios. For that reason alone, T5 needs to be excluded. It gets worse when people bring T5 DD's in. Aside from the Kam Triplets, T5 DD's are massively at a disadvantage in Scenarios.
The differences between tiers 5 and 6 are far more profound than people realize, and those differences are glaringly highlighted in Scenarios. I'd personally prefer it to be T6 and 7, due to the tiers of the ships arrayed against us. I can live with T6.