It is though, it definitely has the more consistent teams
If Blackout or WAR/Apostles were able to enter the iDevice tournament, they'd have won it every time

But I know that once Alumni stops participating, people will dismiss it as "they just got a lot of free wins, it was easy XD"
Although, as more players begin to play and as more sparrers improve, GSTs only get more difficult to win, especially when you make a commitment to not changing your team

GSTs started becoming more competitive in 2012, at least that's my view as someone who played casually starting in 2011 and didn't care to enter them until 2013