Excellent in the first half, but not that good in the second half. Especially that flashback episodes about Kiritsugu's past seemed kinda out of placed. Kotomine was the best character. :P
Well, it's his sole ability after all; "Imagine Breaker" which nullify all supernatural things. The only problem is that this character has "Reality Breaker" as well.
There is also Bernkastel. Baggy as always makes very good and interesting (and cheap :P) characters. I just liked it more if he didn't create most of his characters in chibi form.