Well with fangames I am referring to Sonic, Mario, Megaman, Street Fighter and the such not the retro ones, the retro fangames are cool tough.
Well... depending on which game in the series that you're referring to it COULD Be retro.
Anyway, I doubt that anyone is really going to have a problem with fangames.
There are no fangame-specific tutorials aimed at new users like there is with "Ghost Shooter", so if someone makes a fangame then they are at least recreating it's gameplay through skill/innovation.
Still, it's a bit harsh to outright BAN all GS Clones. A sticked thread for newcomers to post their first success with making a GS Clone sounds fair enough. People have to start SOMEWHERE, after all.