While searching in the Internet, I came to know about Werner Heisenberg's attempt to obtain an Unified Field Theory (see the book Introduction to Unified Field Theory of Elementary Particles). But also it has been mentioned that since this theory is non-renormalizable, it wasn't a successful candidate for the UFT. Was non-renormalizability the only reason? If not then what were the other reasons? Specifically, my question is that was the theory abandoned because it was wrong or because it wasn't practically efficient? If it was wrong then can some instances be provided?