What is his charisma and is he proficient in perform (comedy)?
I believe that they, like pretty much all of the wizard subclasses, are a lot of fun and are very effective throughout their careers.
I personally prefer the subclasses that have more 'iconic' abilities, such as the hypnosis of the enchanters, the advanced illusions of the illusionists, and the world alteration of the transmutation wizards. They may not be more powerful, but they tend to be more 'actively iconic'. So much of the abjurer and diviner are responsive and non-dynamic (while being very powerful). Diviners and abjurers tend to be stronger PCs, but the others are string enough and have felt like more fun to me. I definitely do not regret playing an enchanter wizard up to level 11 as one of my current characters.