Well, we are 2 adults and we had a blast. It's aimed more at Japanese locals than foreign tourists in a lot of ways, but it's all just so darn cute and not hard to figure out. The shows are well done and quite elaborate - they are timed so you can go from show to show for most of the day. So, if that interests you, I definitely think it's worth it! It's also indoor so perfect for any weather. I think people compare it to Disney or whatever and that's where the bad reviews come from. It's NOT Disney and not trying to be. It's its own thing - and we loved it for that!
Definitely don't miss the Cinnamoroll boat ride and see as many of the shows as you can - some are very bizarre and just so Japanese, and they are all well done. Find out which character they are celebrating when you'll be there and learn to love that character - they will be everywhere with special shows and desserts. Meeting Hello Kitty in her fancy house is pricey, but we thought it was worth it.
We were there from open to close. I don't remember the exact hours...I want to say it was like 10 am till 5 or 6 pm.
