I think he is pretty good but clearly he is repeating key lines and messages which are intended to say “Labour has changed”, “trust me I live for public service”. Blair was much better at this. Starmer doesn’t sell soundbites very well, and his answers are sometimes lawyerly, so he gives the key bit of the answer at the end after working through the logic.
Good lawyer technique, but good politics? Not sure. Thought he got a lot better when he had got through the “reassurance” messaging and got specific on what he would do.