In SB, you 'lost' three dungeons. (4.1, 4.3 and 4.5 only having one dungeon as opposed to the 2 per patch in HW.)
You 'gained' the Arsenal, two Ultimate fights, and four zones for Eureka. With quests, several Notorius Monster fights per zones, and the logos system in the later two zones.
If you don't think it's worth it fair enough, but Eureka had a lot of casually available content. It's just debatable if that was good content.
