It's pretty amazing at everything it tried to do except telling a story. Shithouse at that. And most of what it was trying to do different to its predecessors is not what I was hoping for or wishing for. But for the most part (writing aside) I think they probably did really well at the things they were trying to do. Put it this way. I think it's probably the weakest of the whole series, with so many major structural and functional design issues I've lost track, but I've already sunk 100's of hours in, and expect many more once the rest of the DLC and GECK are released.