I like the sea days! I can deal with the 3 ports in a row but don't particularly like it! On the Brilliance, we had two sea days at the end, which to me is ideal!
I don't think I'll ever book a cruise with 5 or 6 ports and only 1 sea day. I need at least two sea days on a week cruise, ideally 3 sea, 3 port is best.
I loved my transatlantics and Panama Canal cruises, lots of sea days!!!