A Munchkin's dream. Bad Idea.
Ex. My fighter class.
Good Saves: All (6 points)
Good BAB: (4 points)
Feats: High (1 per level) 4 points
High Ability Scores(2 points)
D8 HD: 3 points
8 skill class list 1 point.
Low proficiency
EWP: Your Choice
Shield Proficiency
Heavy Armor Proficiency
8 simple weapons
This quickly outscales ANY normal fighter. They don't even end up hurting in HP, because with their highter ability core boosts they can get at least a +2 to con.
unless you want to just make a lot more powerful fighters, rogues, monks, etc. (spellcasters can't do much with their 15 point expendature) this system is useless. Also you can't even add special abilities.
This system, like most any point based system is open to severe exploitation. It is broken, and I don't believe you can fix it.