I think there are two possibilities...
a) Jûbi clones are as strong as Zetsu clones, so, Sakura's attack was just a regular one, so it isn't a big deal.
b) Jûbi clones are as strong as a Madara's Wooden Clone. In this case, Sakura surpassed Naruto and Sasuke in terms of strength.
In any case, we can't start making conclusions because we haven't seen Naruto or Sasuke trying to get rid of these mini-clones. It will depend on how many moves they take to get rid of the same quantity of mini-clones as Sakura.