[MasterNuke]

Eh... nothing really ground-breaking.
Some monsters were made but they aren't really that exciting and you don't really see them that often anyway.
Spells were worked on, but now it's more imbalanced than it was before in my opinion. Graphic-wise, it was an upgrade. But now there is only like 2 or 3 spells that are PvP viable.
Alchemy got revamped. Reagents are all obtainable items now.

All in all, I say you didn't really miss anything. GK is still the same boring grind as it was before.