With all due respect, I don't know what you would want us to say. If we say "yes" - you're stuck with a bad investment card and feel terrible. If we say "No", you will likely still think you made a bad investment otherwise I don't think you'd be asking.
In my personal opinion, the 960 is still a great card. So the important thing is if YOU are happy with the performance you get from your set-up, then no it wasn't a bad investment. And ultimately, technology (especially GPU) is transitioning rapidly day by day, EVERY card by all accounts is a bad investment. The GTX 1060 now will be a bad investment to someone in 12 months no doubt. and by that logic, if everything is a bad investment, effectively nothing is.
If you are happy with your performance, no, it wasn't a bad invesment at all.