I manage to have fun here in my 20's so that has to mean something!
Some of the exhibits were out of order when I went and a few have been there since I was a kid, so it could possibly use an upgrade. However, I still found it really enjoyable and interactive. It's great for kids but still fun if you're older.
I also saw an IMAX film, despite the high price, and had a great time!
Plus, this is in a great area. Go on a nice day and enjoy the lakefront before and/or after your trip. It's really beautiful and I hope more things get built in this area.