Not only is adele's voice a staple of that album, but adele came to the states with no baggage. People already have an opinion of Lady Gaga, no matter what she releases, it will not be universally liked. 21 is a universally liked album, I mean, its reigning success is proof of that.
Well, people do think she's full of herself. That's not representative of everyone, or even a majority.
However, a majority of the population aren't music buyers either.
The majority of the population thinks every celebrity is full of themself.
I mean, realistically, only netizens have that opinion that gaga is fake and pretentious. The GP, like the poster above said, thinks she's weird and a new madonna.