I just watched the last episode of Kurenai, and right now, I'm a bit disappointed. The animation was nice, I liked the character design, the voice acting, and the basis of the story, but the last episode wasn't too my liking. There wasn't much action, which I was expecting, but the way things turned out was just... it was as if the writers wanted to have some deep philosophical message, but weren't sure how to pull it off.
Despite all that, I still thought it was one of the better series this season, and aside from the last episode, the plot was pretty tight. I think it's worthy of an 8 or 9 out of 10.
Another take on the series from Star Crossed Anime Blog.
Other news: my PS3 still overheats, but despite that, I'm on the last act of MGS4! And I have new calibration settings for my Samsung 46A550.