I ran across this build and thought it looked interesting, so I'm running one for my fighter life.
The one limiting factor I've found so far is Action Points. There just aren't enough to go around for everything this guy wants to do. Between Kensai, extra dragonmark use, healing amp, and Ninja Spy, I can't possibly fit it all in.
I'm spending a feat and 9 AP to get Ninja Spy, 5 AP of which are completely wasted. Dodge, Improved Jump and Tumble, plus a useless ability will get me +2 to sneaky skills and 1 min of a stacking 25% miss chance.
So my question stands: Is Shadow Fade worth it?