I have a condo where solar has been installed a few years ago. No assessments for it. As Bubo pointed out, each case must be assessed on its own merits. There is no generic conclusion that it either works or it doesn't.
It always comes down to the specifics. In my other place, solar does not make sense for me because of all the shade I have created in 35 years of stewardship. Others in the same neighborhood have installed and benefitted. As for the future, better technology will lead to better solutions.