Says the guy that only uses a great sword.
First off, I can own u with a Longsword or my new friend Mighty Bar Mace anyday, maybe unless you were using that OP noob MW Miaodao you lobbied in. Great Sword is a nice weapon, but Sword of War is still a lot more popular.
Anyways, I don't think the Great Sword needs a buff, but I would glady trade swing damage for thrusting damage on it. Everyone knows most of the swords are the same thing with different models and barely any stat differences anyways, and weapons in other classes often get +3 added to thrust and +2 to swing if they are primarily thrusting weapons to begin with.
Wouldn't want it too high pierce and low cut though, because that's where the Estoc should be
http://forum.meleegaming.com/game-balance-discussion/new-two-handed-thrusting-swords-estoc/