Puzzled by the critical adulation for A Star Is Born

I don't really get all the hype around the 3rd (4th if you count the Bollywood v) of A Star Is Born (2018); it will probably be nominated for a BP Oscar but won't win (inevitably it will split votes w/ Bohemian Rhapsody, which pleas to the exact same demo). Yes, Lady Ga Ga is a really good pop singer (and dancer) w/ her unique sense of costumery and yes props to Bradley Cooper, who costars and also does a good job directing, keeping the plot moving along and not dwelling on himself, as many director/stars will tend to do. But honestly I didn't believe in their relationship for a minute - he's a huge stadium rock star who wanders into a drag-queen bar and is blown away by her singing - it's odd and a little annoying that the talent he discovers by chance is the only one in club who's not in drag, but so be it. Her performance that blows him away is OK but she's no Edith Piaf, but let's just accept that he spots a potential future star; their romance and eventual marriage is equally hard to fathom, as he seems much older than she  and why either would be particularly attracted to the other will remain one of those mysteries of love. As everyone in the world knows, the movie traces the ark of her career - at first his discovery and protegee, then branching into a solo career when she's discovered by  hot agent who gets her to change her act into more of a costumed dance #, a transition, actually from say Alison Kraus to, say, well, Lady Ga Ga. Cooper (Jackson Maine) can't abide her success, in particular because he sees her new flashy style as fake, and goes deeper into his long-time alcoholic funk. I actually tuned out about an our from the far-away finish, but was filled in on the dark ending, darker than I would have expected. But overall I couldn't buy into the lead characters, found the ingenue/agent/aging star motif to be shopworn (for better examples see the Ray Charles or the Johnny Cash biopics, or for a singer in a funk see Crazy Heart) and the music not especially inspired. But then again, this movie was not aimed at my demo, either.