Luffy also has a really good consistant history of tagging and then beating the snot out of speedsters. So now he's not only really good at catching them he can beat them at their own game now too.
Hence why he owns even Fifth Gate Lee.
That and also there's the small matter of Luffy being a Class 100 speedster with incredibly varied attacks, resistance to blunt trauma through the roof, immune to lightning (So Sasuke's Chidori, even his full body one, is useless), huge resistance to poison and the ability to amp his stats even further with Gear Third.
If it hasn't disappeared check out the Luffy versus Four Tails Naruto thread I made WAY back, it might still exist but I went into Luffy vs Naruto as a whole in great detail.