@Syllvein, Gamestudio 3d is very powerfull, and how good a game can be made with it looks or runs depends more on the skills of the person(s) who made the game. it is possible to make to a game like Massa Effect etc.

Before you make a huge and difficult game like that, I recommend you make some more simple games first (like a doom 2 clone or something like that). Even that can be pretty difficult in the beginning.

Anyway, the AUM Magazine contains alot of usefull info, worth checking out. Also best is it to make things yourself instead of copying from a template, since some templates are outdated and you learn less ofcourse.

Good luck!