I've pointed out that everyone's character was a mary-sue/gary-stu in Void several times to .sickling. >_>
I remember bitching about it a lot because I wanted to kill Rai dead about halfway through.
On another note, a lot of things bypass the test's questions, and a lot of characters that are kill-'em-dead sues don't get caught by that test. And my characters usually have some sort of Sueish quality to them, but I try to keep things original and well balanced, cause otherwise I'll just...kill them dead...
ALSO, raising the bar to 27 has a few good/bad possibilities. While it does allow for more abilities and a little more character depth, it also allows for some horrendous Sues and Stus to slip through the "iffy" cracks of the question. Usually, it's easier to let the creator/OP decide what will and will not be considered mary-sues/gary-stus. Generally speaking, if the OP has at least some small amount of character-building experience, he/she will know where to draw the line for Sues and Stus.
Then again, this is all just personal experience.