on the plus side it is cheap... on the negative side 'you get what you pay for' which in this case is very much on the 'homebrew system that looks a lot like the others'.
I'll admit to having a preference for simple systems so as soon as I find something with page after page of tables I tend to lose the will to continue. What G-core needs is something that makes it different from all the other near identical systems. If you want a good selling point check out the elegance of Icons, the detail of Mutants & Masterminds, the flexibility of Truth & Justice.
If you want a simple comparison have a look at Resolute - which does everything you need in a fraction of page count
[1 of 5 Stars!]