If anything, the more I think about it, Begins felt like an Elseworlds Tale. It was hardly a Batman film; it was an interesting experiment, but it was not until the sequels that the creative team delivered a film that legitimately looked and felt like a Batman film.
An interesting perspective, given that a recognizable portion of the fandom think the exact opposite, that the TDK-titled sequels lost the sense of Batman that Batman Begins supposedly had.
BTW, I share your growing ambivalence towards the film. Every rewatch gets a lower mark from me.