Mechnomancer: An even MORE limited spell selection and a ton of special abilities I'll never, ever, see in the entire build? Why bother? As for convincing everyone else to take Tomb Tainted Soul just to accomodate my character... ah, no. Even I have my limits for bending the rules to work for me. As far as creating my own army and taking over the world, every character can do that... and often does...
EDIT: Aside from that, no Death Domain for Dread Necromancers (yet again). EDIT 2: AND it's an arcane spellcasting class. I suppose you could do a Dread Necromancer/Wizard/Ultimate Magus, but that's not the character I'm looking at...