I don't think anyone intends to insult the creator of a story we all clearly love. GRRM is certainly justified in exploring his world, but that doesn't abstain him from (fair) criticism.
ASoIaF has mounted the same mare that Robert Jordan's "Wheel of Time" series did...it unfortunately is starting to resemble an exruciatingly slow paced mule. I can't be the only one who hopes Sanderson is given the reins to this tale as well.
But in terms of ADWD, very little seems to have actually happened, in comparison to Martin's first three in the series (I feel the 4th book also suffered from pacing, but major, memorable events did occur in the midst of the plodding, at least). Unfortunately, as I read it became apparent that the author had lost the sense of who the characters were in previous installments, and sought to recreate them.
- Tyrion is different from his previous characterizations in canon. He meanders this way and that on his way to Dany... (But still has not reached her by the end of the book)... all the while his internal dialogue gets more and more whiny. Gone is the quick-witted Imp who always has a few cards to play in his favor. He is now a babysitter for a young (and somewhat sow-headed) idealistic dwarf.
- Dany literally sits in one place, waiting for things to happen. Gone is the "Mother of Dragons" who makes decisions with authority. She is now Dany the great procrastinator and second-guesser, becoming uncertain at the mere sight of an alternate viewpoint.
- The major events for Jon also happen near the end, with no REAL character development for him on the whole... Just a repeat of "life is hard for Jon at the Wall."
Similarly, other characters with well established personalities seemed to suddenly become much weaker characters with little to compel them through their travails. Whereas once they were strong and decisive, in this book they seem to have suddenly become mere shadows of their former selves. Virtually none of the characters remained true to themselves. All in all, the book has that "stalling" feel... Like Martin was just filling word counts until he got to the cliffhangers... I honestly feel the book could have been trimmed to half and we wouldn't have lost any important information.
Martin did a superb job with his first three books in this series, and I'm holding out that he has some fantastic payoffs planned... But ADwD was underwhelming as a whole and I'd be lying if I said it did anything other than instill a serious sense of doubt in his ability to close the tale.