i think its because the communication is a bit weird sometimes (irritating) and rises too many expectations and/or leaves too much room for stupid interpretation. And if i think about the poll... it wasnt exactly a way to tell SE what i/we want imo.
You had very few choices and it was a lot black and white. So its only natural many ppl are disappointed.
The question about instanced dungeons was flat and i would have rather not answered it since some big events can be instanced and still be very good, and larger scale stuff can be very annoying if not instanced (i remember a lot of arguing if we got zonejacked by other ls in dynamis or limbus....). if these areas were instanced that wouldnt have happened and nobody would feel different about these zones, except you dont gather 30+ people only to find out that nothing happens today. Instancing too much on the other hand kills the rest of the world and makes it feel dead. but i dont really think they will do that , but well its only a suggestion, who knows...
another thing is.. people get impatient.
And i think thats only natural considering SE didnt listen in alpha and beta and was BShitting us in the first place...
The new team has a hard time now. But i can understand every ff fan that gets impatient, pissed or worried about how the game will develop.
In the end - nobody really knows what the game will become like and we can keep fighting and speculating til the content and patches arrive... thats something at least isn't it?