Dang I love 8 and 9. 8 definitely feels unfinished, but there are story moments that stick with me more from that game than almost any other. I played through all of the games in order so 9 was like a return to form for me. The first 6 games are much more of a fantasy setting so while I enjoy 7 and 8 it was nice to go back to the main setting of the series. I'm on X-2 right now so I cant comment on the later games.