Its true that it wasn't as great as the real storyline but its necessary with popular anime. If they temporarily end it alot of fans will be pissed. So they give them something to keep them occupied. But there is one thing in fillers we usually don't pick up. They leave tiny hints of what is to come. Its not often and very rare but they show you a glimpse of what is about to happen. Anyway I think its worth it to watch some fillers. Makes the real story so much more valuable when you see it.