That is my point, exactly. I havent read it, only playing it. But, so far to me if has felt like DM issues running the adventure. I'm not sure if the OP sees it that way.
I have had a similar experience as he has, but I have felt it was the DM, not the adventure, that has made the adventure not as fun as it might be. From a player perspective so far it has been pretty crappy.
I actually have had a lot of fun with the adventure. I've suspended my disbelief over certain aspects (like going to a town with a dragon flying over it, or attacking a dragon) and am just going with the flow. It helps to have a group of real close friends to play with.
And I am biased as to the DM (my teenage daughter). I do think that her last encounter (one evidently not in the book) was a bit heavy handed (and way too difficult). Our group had planned an ambush and were ready to run if it was too tough and we never got that chance. She was a bit stoked about her encounter design and I think she really really wanted to run it and kind of shoved it at us. But I do know that we are off the beaten path (staying at the rearguard location for multiple days), so she did have to come up with an out of book solution. After we go try to rescue the Monk (assuming we survive), we are off to Berdusk (which I suspect is really off the beaten path).