Popularity is no guarantee of quality.
True, Boyzone for example, more #1 singles than anyone I think, but Boyzone didn't pick up any Oscars, Grammys or Novellos.
There's popular, basically any combination of teenage boys, (from solo to five of them, singing covers), and there's popular AND critically acclaimed by peers.
Singer song-writers usually pick up the gongs. Adele is no exception.
Roger, please don't dis' the Carpenters, they did "Goodbye to Love" so I forgive them the "interplanetary craft" thing. Extraordinarily beautiful, and distinctive, voice (plus a great guitar solo in the aforementioned song).
As for Debbie Harry, I still remember the moment she appeared on TOTP, it's burnt into my synapses. Only much later did I realise she was a "war baby" and actually my Dad's age.
It took way too long for Debbie Harry's actual talent to be recognised on its own merit I think.
But that's another thread, sigh.. (off to watch "The Hardest Part" on Youtube).