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Personally, I thought the main story was the best in the series and the mature feel of the story was refreshing. My biggest complaint was the removal of the level 100 battle option in wifi battling and how that basically stopped me from playing it as long as Pearl.
I thought that N was the hardest, mostly for the fact that if I didn't get my Zweillous's dragon rush on his Reshiram(not sure on spelling) he would sweep me like he did the first time when I was unprepared.
I agree that the sages could have had a larger part in the story but who knows what kinds of events they have in store for us that unlock stuff like the back story of your rival in Heartgold and Soulsilver with Celebi.
I just wanted to let you know that all Tm's have unlimited use in Black and White. Plus I don't think you can trade them. I could Ev train for you, I need motivation to start Eving in Black and White anyway.