No love for
Natsu no Arashi around here? I found that to be highly enjoyable in all it's quirkiness.
The only Shaft series I've struggled with was
Ef: Melodies. I thought Memories was brilliant, but Melodies felt a little too over done at times with the melodramatic effects. Still worth watching, it just seemed they were using style for content a bit too much.
I watched
Negima!? before knowing anything about the franchise (no preconceived manga/anime notions) and was very impressed with the visual quality of it. I absolutely adore
Hidamari Sketch. I haven't seen the DVD version of
Bakemonogatari, but I thought the minimalistic approach in some of the broadcast episodes was used effectively and gave it an appropriate look and feel.
So yeah... I like Shaft.