The Ex Weapon thing is only 1 attack. Like Lu Bu has a move where he runs forward, grabs someone by the face, then slams them into the ground that is done by pressing triangle again after doing his C3-2 attack with any of the 10 Fang Tian Hua Halberds. Characters do have their 2 Musous that generally use their Ex Weapons, but your Musou won't change if you use a different weapon. Thus, the only incentive to use a character's given Ex Weapon is if they have a really OP Ex attack with it.
The weapon system overall is very flexible, there are even seals you can unlock that will make any weapon of given class become 3 star if you have that weapons' Compatibility seal equipped.
Tkawsome said:
What's the upgrade system like in this game? Is it automatic or is it a skill chart like the last game? That was the only thing I really liked about 6.
Skill Trees. You get S5, S6, C5, C6, a second Musou stock, your secondary musou, a skill to get +2 skill points per kill and a few other skills from a character's skill tree.
Stat increases are the old +1, +2, +4, etc... type drops from killing officers.