About 40 percent of the entire series was filler, and some of it was actually pretty decent. Not only did they have excellent writing and animation, but some filler arcs also added to the story with meaningful contributions. And then some filler arcs gave us ninja ostriches.
Another series of one-off stories, this arc is a good example of bad filler. It's mostly a series of flashbacks to the original series' days. As if 140 episodes from the original series weren't bad enough, here they are again bloating Shippuden.
Weirdly enough, this filler arc has a lot of kisses in it. Sasuke and Naruto end up accidentally kissing again in a fairly funny episode. Even Kakashi has an over the mask kiss with a childhood friend of his. There is also another decent episode hidden in this arc about a cooking shinobi recalling a tale about Naruto.