I think Vayne is a pretty wicked villain. As mentioned, he has some wonderful lines. However, I believe they could have focused on him a bit more instead of just throwing him back into the story like that. Although he wasn't just thrown into the story all of the sudden, he wasn't reintroduced in a very fluid manner (especially when (SPOILER) Cid and Gabranth start stealing the villain spotlight). Oh well, awkward pacing of the storyline has already been pointed out too many times to count.