I really liked Hold It Against Me at first, but now TILL THE WORLD ENDS has been released I can see that the previous single is not one of Britney's stronger offerings.
The music here is dark, gritty electro and the song is lyrically stronger then any of her singles for the last few years; It's a basic dance-in-a-club number, but the sexual suggestions are there and are subtle enough that it's not cheesy, roll your eyes or lewd.
Best of all? There is some autotune here - especially in the bridge - but much less than there was on Hold It Against Me, 3 or her Blackout album; She may never be mistaken for Mariah Carey, but she does have an agreeable voice, with a distinctive purr to it.
Music? Strong. Lyrics? Strong. Vocals? Almost back to the good old days.