Tried mining with my GTX 750ti, but the results were ridiculous. Is it the GPU or is the mining on GPUs dead in general?
1. Your card is a bit old it may lead to loss( reward lower than electric bill). If you want to invest in mining you should find some new cards with generate high hash-rate and cost low power. Such as AMD Rx580.
2. GPU mining still be there for the alt coins which was built resist ASIC.
3.
https://whattomine.com/coins support the calculator quite accurate you can find you best choice.