Food: I didn't see "ambition" in the MDR menu or otherwise - in fact we were lucky to see food our service was so bad. Our group was spread at multiple tables, and it wasn't just one section where the service was bad. ALL of us had questionable service.
Entertainment: I found entertainment boring as an adult. ICK. I sat through the captain's toast with the TA in charge of our group and then bolted. I've seen better in non-Disney theme parks.
Activities: I don't really go on a cruise for activities, so I don't pay attention to these either way.
Kids: I was FAR more aware of kids on HAL than I ever am on Disney. Chalk it up to a couple of things - 1) There is NO adults-only pool or area on HAL (again, at least on the Westerdam, but until they change things, she's one of their ships in Alaska) so there is no escape from them without paying for the spa equivalent of the Rainforest Room. 2) At least in Alaska, their club hours seemed EXTREMELY limited - I'd often at various times of the day be walking in the hall where the club door was and it was always closed and dark with no one in there. 3) From listening to the kids swinging off the sculptures at the pool whine, the activities were "boring" and they didn't want to go even when it was open.
Staterooms: Given that I don't do the suite thing, I can't comment there, but I would hardly classify their standard verandah as the same as Disney's Category 5 - split bathroom or not. I travel solo, so I had plenty of room, but I cannot imagine trying to share that cabin with more than one person...and then only someone I knew very well.
Just goes to show that people can have very different experiences though, so YMMV.