Kagutsuchi was...easy. Really easy. A little bit time consuming, but after all the trouble I had with Baal Avatar, I was expecting something a bit harder. I think it was how formulaic he was - the Trumpeteer was the same way, although his pattern was a little harder to figure out. And I will admit I laughed at Kagutsuchi's second form - I think it may have been unintentional, but the brick bits that poke out of either side of his head look like silly mad scientist hair. I'm also trying to figure out who/what Kagutsuchi is - God seems a little too obvious in some senses, and not quite right in others. Possibly I'm looking at the wrong mythology
As for the ending - wow, that was anticlimatic. But I knew at least one of them was going to be 'you wake up and nothing has changed!' - you know, the ending we (or at least I) are going to kill CLAMP for if they write it into X. The little Lucifer snippet at the end was kind of neat, though.
And it's probably a bad sign that my first instinct was the start my New Game+ game. I only managed to stop myself because I still haven't come up with a good name for my demifiend. This is the point at which I admit that I had only been planning to muck around a little in my initial save file, and thus gave my demifiend the first halfway decent name I could think of, which is that of a VtM character that never was. A paranoid, aristocratic, English Victorian Age VtM character that never was, no less. I got too far in mucking around to want to start over, so my demifiend has remained Julian Astley the whole game XD;