Another way of looking at it is that only 22% of respondents to this poll were negatively influenced by the actual game. 78% of respondents (likely including self-selection bias in favor of those who changed their mind for the worse, since that's the thread title and such people are more likely to respond when they feel that their opinion in particular is being solicited) either like the game or weren't going to play it anyway. Furthermore, this is the internet, where one can be reasonably assured that your average tabletop RPG player isn't going to frequent because it's just another past-time. ENWorld (and most RPG sites out there) are populated primarily by the "hardcore" among the hobby, and such people inevitably see themselves as above the casual - this fosters a sense of collective elitism, which in turn fosters conservatism (used here as hostility towards change).
Given what objective evidence we have of 4th Edition's success, threads like this have little purpose, if any. They simply perpetuate an echo chamber mentality, which I think most would agree isn't helpful to a community at all.