I loved Obi-Wan in the Original Trilogy.
Then I hated him in TPM. Obi-Wan in AotC started to exhibit some of the traits of old Obi-Wan, but Ewan's acting was still kind of stiff.
Obi-Wan in RotS was one of the most compelling characters, and I especially loved the way he allowed emotions to come over him in the climactic duel, yet it didn't reflect very much in his combat tactics.
Overall, I like Obi-Wan Kenobi.