I think movie Kirk (at least from TMP to VI) is a very, very rewarding rendition of what Kirk would be like as he advances in years. People want TOS in movie Kirk but that's a mistake. I don't want TOS Kirk in Movie Kirk.
Kirk is an unhappy and frustrated admiral, wannabe captain but as a man he grows, he finds that some things in life are more important than the big chair, he deepens his rich friendship with Spock with his rescue which exacts a profound and terrible toll on him that moves us all (none of this skip onto another episode he's fine n' dandy business) and that great triumvirate of Kirk, McCoy and Spock are also tested, crowning a legendary friendship. The big chair takes a back seat with all these things that really matter in life.
In VI he struggles badly to overcome the death of his son and all that baggage he has with the Klingons, he fights through that pathological quagmire and at the end he seems at peace with himself. signing off in poignant style bringing closure to a great career.
Generations -- this is Berman's show. He writes well enough for his own TNG squad but Kirk bobs about like a loose end in that film with the flimsy Guardian of Foreveresque plot device waiting to be crammed into his "I'll die alone" prophecy he made from V.
So Generatons didn't really satisfy me with Kirk -- but the rest of the films Kirk enjoys some great character development and with plenty of sublime acting from Shatner, dodgy fight scenes notwithstanding.