Let's be real for a second here. Apart from Bad Romance, Gaga managed to get a number of other so-called "hits" but none of them can actually hold up in court, because all of them can be explained by a series of lucky events. Let's see:
From The Fame:
Just Dance (reached #1 because of people just trying and see what it was)
Poker Face (reached #1 because people were giving Gaga the benefit of the doubt after her first singe failed)
LoveGame (the video was sexual)
Eh, Eh