Once again, the Tripadvisor rating description causes problems. Surely if 5 Blobs is excellent and 3 blobs is Average, then 4 blobs should be "Good" not "Very Good?"
Anyway, 4 blobs, "Good". I wouldn't categorise as very good, but is was much better than "average". So deserves 4 blobs.
Don't be under any illusions, this isn't really a museum, its really a children's play locations based across a number of floors, and there is nothing at all wrong with that, our toddler really liked it, which is all that matters to us.
It's worth a visit, especially if you have toddlers, they will really enjoy it.