I don't like that they changed Isaac's face. There's no law that says a character has to look like their VA, and I thought Isaac's original face suited the character better.
Yeah, Threepenny Revue is one of the shorter and easier missions. But I think it's nice that TDM has a range of different mission sizes and difficulties. Not everything has to be a gigantic sprawling masterpiece.
The Thief formula, and TDM in particular, has really proven to stand the test of time. With a solid community and new mappers emerging all the time, I don't think we're in danger of fading away any time soon.