It was my impression that Shippuden translates to "Hurricane Chronicles," which I would have been quite pleased to have seen directly translated for the English audience. Correct me if I'm wrong.
The pacing in the anime has often been very bad. Some parts actually get compared to DBZ, which if true is pretty damn awful. That said, I think the story and characters are actually an improvement. It doesn't fill in part 1's gaps, in the sense that characters that only got a broad overview before are mostly still the same.
However, as a result of that, there's more purpose to it. Most of the plot is related to Naruto or Sasuke in some way, and when it does turn attention to another ninja it usually succeeRAB pretty well. Some people gloss over it, but Sakura and Chiyo fighting Sasori is a genuinely good fight. That first arc also makes a point of telling us that we're looking at Tsuande's successor. You could say the Sasori fight is a little long similar to the rest of the show I suppose, but even if that's so they at least knew how to direct the action and build tension. When the fight hits its climax, it's utter chaos.
Then you have what's basically Shikamaru's arc, and it was awesome. The boy basically grows up into a man right before our eyes. He's arguably right behind Naruto in terms of the quality of the so-called rookie nine from part one. He's been very well developed. I'm sure fans of a particular former genin hope their character will get improved in a similar way.
However, does the story really have to do that? I think Hurricane Chronicles is probably better off for picking a handful of characters to elevate instead of trying to give a couple dozen different characters attention. Then it just struggles to give everyone their due and fails on most counts. That's what part one often did, especially during the filler: basically pulling people's names out of a hat and then sending them on missions. I say save it for the movies and let the main story do what it should. A character should be used if and only if it makes sense for he or she to be there.
Granted, part one had some good canon stories. I can even see why you'd introduce a lot of characters, if only to give us context about the world. Neji's story, for instance, was legitimate backstory for both himself and the setting. However now everything is all grown up, and I'd rather see issues getting resolved then seeing new ones crop up for 20 different characters. Bleach likes to do that, and to me it's a reason why it isn't as good as Naruto.
If the pacing is too much of a barrier, there's always the comic. At the end of the day though, I respect part 1's canon content but I prefer part 2's. It's moving the story forward more than part 1 ever did.