I think IGA never war really THAT talented to begin with.
Basically during his run on every good idea of his there was some bad idea. And I'm not talking about that even some of his best ideas were executed badly and I don't think it was lack of budget or time constraints.
While OOE was enjoyable it was just another Symphony clone, that recycled practically everything from previous games. It was like a puzzle, where some parts from past games were rearranged to create something new. Though it maybe have something to do with the guys from Circle of the Moon team who, as I heard, worked on this game. After OOE I was willing to give IGA some credit, and see what he can do. But arrival of atrocious Harmony of Despair (I'm talking about "visuals" of this product) killed in me all hope that IGA could create something without recycling his past ideas and graphics.
Now, I hope that LOS will prove itself as a new start for the Castelavnia and IGA will be removed from the series as far as possible.