This was the 1st anime that I had watched in 7 years, and it was amazing! Some parts are so confusing, but you'll eventually understand it. There's a dark side, but also some very funny part. The art was really good, and the storyline was nice, too.
But I didn't really like the 2nd season. It made me very mad, mainly because
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at first, it showed Claude and Alois and I was like, "WHO ARE THESE SEBASTIAN AND CIEL WANNABES?!" but then later in the episode, it showed Sebastian and Ciel which made me happy, but I hated Alois. I know that he had a tragic past just like Ciel, but he didn't have to poke Hannah's eye out with his finger, made her undress in front on him, and abuse her.
But other than that, I would recommend it!