For the most part, yes, I can sympathize. I wasn't crushed with disappointment or anything, but I think most everyone was so impressed by the trailers for BBS that the game found itself in that horrible wonderful place of being drastically over-hyped in a lot of ways. But not all of them.
Blank Points was still totally fantastic, and I felt a genuine connection with a lot of the Disney characters which I thought had been lacking in KH2 and, to a certain extent, Days. I think most of the games flaws were actually image-oriented; for instance, that scene where Ven's floating in the Lanes Between and he sees the Land of Departure, and the camera zooms in and it's just this silly looking orb...oi vey. Stuff like that. But I thought the game balanced that well with some pretty great character interplay and scene composition: the stand-off between Terra and Ven and Eraqus is still one of the greatest moments in any KH game, in my mind.
So, it was a bit of a mixed bag where some people expected a masterpiece. I expected a good game, and I think I got one.