You cannot disregard that peak position means nothing to merit a success of a song for in that particular week that song reached that peak and out peaked other song just to get to that certain position... Although in the long run longevity is key.
Long Story Short:
Longevity>>>Peak>>>Not Charting At All
Although in the run of Gaga's single, Judas was not up to the normal standard so it's a
*semi* FLOP