I think many gamemakers underestimate Gamestudio 3D. Next to that, I have heard that the templates from UDK etc. are way better. Personally I dont use any templates anymore, I have used a template once but noticed it was heavily outdated.

However, if you have the freetime and hone your program & modeling skills often, you can create some wonderfull things with this engine.

As for the somewhat dying community, less gamestudio 3d programmers make us leftovers more special .