Played SH3, lost interest, too repetitive after a 2 year campaign.
Played SH4, had a great time, lost interest on the return trips because of the constant wait for night/ run surface / wait for night manually. Whished their was a way to auto that, or to autodive when radar sights a plane. The trip home from Japan is a pain with about 50 interruptions.
I'll buy the Uboat Addon off course. For now, back to Medieval Total War, awsome game, while waiting for "Empire".