>Thief 3 and Invisible War...they cut things back, took shortcuts
Seems to me, at some point during the development of DX2, it became apparent that the Ion Storm Studios were going to be closed. Having worked for a failing tech business, I know that is a sucky place to be. Watcing your friends get laid off as they complete their tasks, etc.
I'm not surprised they didn't do their best work.
I do think it is funny that the Thief franchise has "killed" two quality development studios.