I think GS is fine, seeing as how large the area of effect of Desperado is, it's tough just getting to the damn GS. Throw in a lesser elemental ring and you're definitely going to have a lot of trouble touching him lol.
Immunity to freeze is definitely needed due to that exact fact of the OP combo. Not just that, but with how easy it is to get a SK card? There would definitely be a LOT of frustration. Also, like zero said, freeze asuras. Never fun.
There really is no purpose to Priests. Sure they can Holy Light, if they get a soul link. Which can be easily dispelled. Sure they got stave crasher which might hit for 20k or so if you're good, but how much HP will you have? I've been playing battle priest and the only thing I have to rely on is my asura which sometimes never even shows up in a duel and I just stop attacking due to how long it takes. Sure there's coma, at a .1%. However, only reason I do play this is because asuraing someone in the face with a priest and killing them is always funny.
Stalker is rape in the new arena if they don't have a friendly neighborhood FCPer. I think stalker is fine the way it is, it's just that everybody plays it the exact same way which is so very dull.
Taekwons were never meant for greatness here lol.
I see a decent amount of sinx's idk what you're talking about. Even though they all use the same build, they're there.
LK? The most OP class in FRO, you seriously don't see any?
Creator is definitely fine where they stand at right now, what with the magic spam if you're not taking enough AD damage and the AD damage if you have a GTB on.