I really hate to say this, I dont like to judge other peoples taste, especially on animes, but sometimes I cant avoid it.
Here, Naruto(the shippuden series) is for mentally retarded people, because instead of continuing the main story it starts going to fillers almost after the series start. In fact I watched like 30-40 episodes after beggining the Shippuden series and there was really low progress on the main story. I quit. I wont watch naruto again, no matter how good or how much the story has progressed now. I could say this happened to all big shounen but Naruto has the worst case. In fact I say: "There's a bit of story on your filler" to you naruto fans.
The Classic Naruto before Shippuden was pretty good, I remember too when the show was about ninjas and now they can fly and cast spells and shit. They look more like wizards and stuff rather than ninjas now.
This is my opinion. There I said it.