I must admit, all the people going on about Mega Beedrill does remind me of when Mega Absol was being hyped.
They're kind of in the same situation, except while Mega Beedril obviously has a vastly superior speed, Mega Absol still has enough speed to outpace most the relevant unboosted tier while having better coverage, better STAB, higher-power base moves and a secondary offensive stat with which to destroy physical walls with, not to mention utility in Knock Off and Magic Bounce. I realize Mega Beedrill has Adaptability, but... c'mon, that's only really good for u-turning and destroying fairies. They share the same flaws, too - frail, same speed tier on turn of Mega Evolution. In fact, Absol's BULKIER than Beedrill and it's bulk is seen as a flaw while Beedrill's is seen as "oh it's not that bad you can run a few defence evs to avoid aqua jet KOs". I personally can't see how something like Mega Absol, who has a ridiculously good STAB, Utility, a usable secondary offensive stat, the same Attack stat and fantastic coverage can be considered pretty bad in the OU metagame but Mega Beedrill can be hyped up so much just because it has adaptability U-turn and can I guess kill fairies.