Can I ask, I've heard various reports about the campaign and so far it hasn't been sold to me, Are you enjoying it?
I'm only up to January of 1940 on my 5th patrol (Stock Silent Hunter traffic wears out torps way faster than fuel) and it really isn't that much different than SH4 campaign so far. Go here, sink ships with the occasional drop off a spy or photo recon some harbor. It does tell you how much tonnage to sink for merchant ships or that you need to sink a certain kind of warship. The missions extend over multiple patrols, it took me two patrols to get 50k tons off the east coast of England. Then I took the mission to sink 100k tons in the SW approaches, 2 patrols there and I'm not quite done but after returning on my second trip there I switched missions to take out warships in the eastern GIUK gap area. I'll have to get further before I can truly form an opinion but it's not a drastic change from SH4 at all from what I've seen.