As someone who has been interested in space ever since I was a young child, and an Apollo geek for many years, I was excited to visit the Space Center and see all the things I've always heard about first hand. What I hadn't banked on was the interpretation being quite so poor.
From the first rooms telling the story of US spaceflight, something wasn't quite right. Exhibits were labelled inconsistently, and the lights in the Apollo cabinets weren't even on, requiring me to use my phone torch to read - the whole place is very dark to start off with.
Outside to the Shuttle and Carrier combination. Try as I might, I was not able to work out the provenance of the Shuttle itself at the museum. I assumed it was a replica due to my knowledge of the programme, but I only was able to find this out after the event. It was clear from hearing them speak that a lot of visitors thought it was a real, space flown vehicle.
The ISS exhibit felt... underwhelming. In fact the whole museum felt underwhelming. So much more could have been done with the fantastic history and artifacts they have available to them.
Last to mention is the Tram Tours. Although these are "fine", a major issue is not being able to get off at Rocket Park on the way back from the Mission Control tour, meaning that you have to wait for another tram, and spend half an hour visiting a fairly dull building containing mockups of the ISS - basically a room full of white, featureless tubes.
All in all - if you're not a massive space fan, this probably isn't worth the bother and certainly isn't worth the money, and if you are, please temper your expectations accordingly.