The vast majority of back-and-forth dialog on Twitter and in the official forums has always struck me as an issue where the loudest voices are also the worst at forming cogent, actionable arguments. Whether or not this person complaining about the speed of WW Monks' play-style is correct or not is made irrelevant by the tone of his remarks - inviting a less-than-serious response at best and condescension at worst. He could've made the exact same argument with a different (and less childish) tone and got an actual informative response. Something along the lines of:
"In testing the WW Monk's overall play-style it feels sluggish and unresponsive as opposed to the Rogue or DK. Is this an intentional move for WoD or the result of some kind of tuning issue?"
Throw in some GCD and throughput numbers to back up the argument and you have a cogent analysis and possible issue someone in development might actually take a look at. It definitely scans better than "WW Monk is slow and if you don't fix it I'm going to take my ball and go home." Part of the issue is perhaps the limited scope of Twitter (a terrible customer service tool in my own opinion), but that pales besides the tone of the Twitter OP being puerile and condescending itself.