That's a very good point. I don't really remember much of anything really happening in Wild Adaptor, whereas Bus Gamer was pretty fast paced. The main characters in Wild Adaptor also barely interacted with each other, while both Saiyuki and Bus Gamer started with the leads already working together and with an established vibe. Wild Adaptor, I think, was also a little too caught up in being dark dark dark and edgy, while Saiyuki and Bus Gamer eased you into it(well, what little there was of Bus Gamer, at least)