There is a ridiculous amount of confirmation bias going on with this mechanic, and much of it from people who have never experienced the false positives that Sonya describes. For that matter, i'm not even sure that anyone has a "true" understanding of how the mechanic works (BG included), but instead some have an understanding of what methods work more consistently than others. Its hard to get a read on how a mechanic truly functions when even the BEST case scenario is (again, as given by BG) an 80-90% success rate over the course of a string of attempts.
The "oh, you should have KNOWN its a circle" stuff should probably just go ahead and die off. You can relate nearly anything to any other thing in some way, similar to the Forer effect used by psychics. Call out random associations and eventually one is bound to stick. If the solution was to run in a straight line to the northeast, SOMEONE would equate it to "Oh, tornadoes mostly move northeasterly, the solution was SO clear... how did you not get it?"
The bottom line is that twister as a whole is a questionably designed mechanic, at best, and for a very long time to come even the best farm guilds are going to have nights where they get streaky wipes simply because the method didn't work for an essential raid member at an essential time (read: not a scholar). Using BG's numbers of 80-90% success, assuming only 3/4 targetted people are essential, you are still looking at best a 15% potential kill rate, per attempt, assuming everything else goes flawlessly and you only see 4 twisters. Those odds aren't particularly exciting to me as a raider.