It's a lot better to watch the original "Naruto" series first, otherwise it will be a bit confusing and hard to understand, but not impossible. All the overly detailed analysises and flashbacks make sure to make even the dumbest viewer understand what's going on.
But really, it's better to see a review of Naruto (anime) first, otherwise...
it gets a lot better, more logic put into fights and characters, tho the main characters get a lot more overpowered and imbalanced, at least some of them die (well... rarely)
Still has flashbacks and fillers, still the overly dramatic moments that drag things on, still focused on the main character Naruto that no one really cares about, at least the story is somewhat on a good pace... almost.
I think the more episodes you watch, the better it gets, story is still consistent, with new interesting characters that are constantly appearing... even the animation gets an improvement.
Do note, the story is long, and it might be better to just read the manga (would spare you a lot of time by skipping needless flashbacks and fillers).