I have kind of mixed feelings about Kaiba. I really enjoy it, I think the premise and characters are great. The animation doesn't bother me at all.
I just would rather the plot move some, in a direction that isn't just random characters. I'm sure it'll all tie together in the end and make sense, but right now it feels slow.
But it's really great to watch. I've never really felt attached to random throwaway characters in anime before.