Agreed, it's a good set of Museums, with one ticket (cheap and the same for Thai and foreigners) one can visit three or four Museums. I did notice the issue with maintenance, the Science one is very interactive but some experiences are closed or not operative so I am happy of budget will allow technical improvements.
Agree it is far and not many tourists will venture there - also many Thais do not even know it's existence - may be shuttle buses can better connect with the city while BTS can possibly connect the Technopolis Complex in future