It's amazing! She only released two singles from 19 in North America. Chasing Pavements did well, but I don't think HG even charted They just weren't ready.
As we can see, Lady Gaga is pretty much without flaws:
Just Dance - #1
Poker Face - #1
LoveGame - #5
Paparazzi - #6
Bad Romance - #2
Telephone - #3
Alejandro - #5
Born This Way - #1
Judas - #10
The Edge Of Glory - #3
You & I - #6
Only Marry The Night didn't go Top 10, but it still went Top 30 which is not all that bad for a fifth single.
The fact is that she had 11 Top 10 singles in 4 years and sold a shitload of albums.
Marry The Night and Judas (it's a flop for Gaga although some people would kill for a single like this)
Run the World, Countdown, some of the B'Day singles although I'm not even sure of what was released and what wasn't