I'm not going to stand here and defend Shatner to the death (or to the pain) the guy has shown himself to be a self serving diva beyond a doubt and many times he's been his own worst enemy when it comes to his public perception, so I understand why some people dislike him intensely. Personally though I think people need to give the guy a break at times. He does have some very good qualities and has shown a willingness to make fun of his shortcomings, and personally I think there are plenty of entertainers who are far biggers jerks than Shatner, they just hide it better. But some people, including ST fans just seem to despise him so much they will never give him credit for anything.
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Shatner has issues, no question. But he's rarely complained about being just known as Kirk, always seemed to embrace the role and what it gave him and he's done plenty of other things without ever seeming to have the need to make everyone see that he's so much more than just James Tiberius Kirk.