I'd like to do 3 1/2 stars...
Pluses
A wealth of information...tons and tons and megatons.
Hands on activities (I loved the drop of milk and the Fiesta Ware is Radioactive pieces).
The Ground Zero Theater is a great show -- with special effects.
Convenient location.
Clean and easy to self-guide at your own pace.
Did I mention all the information?
Einstein action figures and dolls in the gift shop!
Minuses
When we went to the gift shop, there were two employees, guys in there mid 20s discussing how slow it was and arguing about NASCAR. We were probably in the shop ten minutes and they never even acknowledged we were there or paused their conversation.
The Museum starts out backwards, you are walking right to left, but the signs are laid out to be read left to right, you end up walking in a U type shape so it corrects.
There is a time line on the walls, but other than that the information seems pretty scattered, not in a logical order.
Barely a mention of any of the nuclear (I swear I pronounced it correctly!) disasters.