I've owned TH.
At this time, I wouldn't say that it is deep, I wouldn't even say it is varied. Yes It has lots of modes but you only have to complete one mode to get to each of the wizard modes and the other goals remain the same in order to get there.
The wizard modes require the same things to be done to reach all 3 of them. Repetitive if you ask me.
Still a very good game with awesome movie clips just not many different ways to play it at this time.
Hope the new code fixes that.