The same could be argued for paladin and many other classes, but in the end the point is you are loosing 1/4th-1/2 of your class features depending on which we are talking about. Its not trivial to be loosing even a 1/4th of your class features. Sure you can still have maneuvers and stances but you are automatically removing two schools and removing random ones inside of some of the others.
And again without an asterisk for the Int, I question whether we can even make this playable. As I said before I did a quick look through templates and I didn't find any that is acquired, can be applied after becoming undead, and increases int to 3+.