Nowadays it's all too common for anime to leave a somewhat open ending so a sequel can be made. It's especially common among manga adapted animes since most time, the adaption of anime is long before the manga ever ended. Kuroshitsuji, to my surprise, actually had a proper ending that didn't just leaving everything hanging. Although it ended properly, I still feel they went a bit overboard on making it too sentimental. Normally I would criticize it because it wipes out too much of the final climax. But in this case, an ending like this seems to be more proper than a dramatic climax.
The story itself is quite brilliant, especially with all the interaction between the devil, the angel, and the grim reaper. This is one of those smart plot build up that they seed some events from very early on to make use in the very end.
Drama: 90 (Good amount)
Comedy: N/A
Action: 85 (Some, not too much...)
Art/Animation: 80 (Dark)
Sound/Music: 90 (Love the music)
Character: 87 (Well developed, especially the devil himself)
Plot: 85 (Little twists, but mostly straightforward)
Ending: 90 (Properly ended the story)
Re-watch value: 70 (Maybe to catch some details you missed first time through)
Overall (not average): 90 ~ Very good
Recommendation: This is definitely one of the top 5 animes from October 2008 season. If you don't mind the religious implication, this definitely should be on your to-watch list.
