Britney Spears' "Work B**ch!" debuts at No. 6 with 174,000 downloads. It's the first single from her forthcoming studio album, due in December. Comparably, her last album's first single, "Hold It Against Me," launched with 411,000 in January 2011.
Don't get too cocky. 1st SINGLE sales do not determine the overall success of an era. See: Born This Way, Femme Fatale. etc.
You forgot I Kissed A Girl and California Gurls! They're both successful 1st SINGLE and both eras continued to produce more top 10 hits. We believe in the queen of the jungle