Love Gaga, but I don't see how she should be above Bey, even though their placements are roughly in the correct ballpark.
For Britney, it's a 2. 1 point, because that's the minimum requirement, and +1 point because at a point in time she had potential to be decent/mediocre a la KP/Rih, but unlike them she actually didn't improve and became worse.
I get the "10" troll votes for Britney, but I'd like to see how some of the people who apparently took the thread seriously and rated her a 6/7/8 arrived at their votes