I find it a bit weird after testing it yesterday for the first time. Sadly my clan is not available over the holidays, so we can’t check out how 5 man vs the fortress works.
I made it yesterday with some sorcerey and sneaking on an agility build (poison arrows, poison daggers, etc), but it still doesn’t feel right. It’s a bit similar to playing Skyrim on a stealth archer.
Next try with the Clan and putting a trebuchet up that can hit outer and inner gates and with thralls