Mega Scizor is really strong, where are you hearing this :|
He's generally outclassed in an offensive scouting role by Band Scizor, outclassed in pure wallbreaking and bulky offense by LO Kyurem-B and in a priority role by Smogonbird and Mega Pinsir, but he's a potently strong threat with great balance on offense and defense. He's actually more physically defensive than Skarmory, the god of "physical attacks dgaf". And with a Swords Dance boost, he's far from a weak attacker.
Only things holding him back are the fact that he's hardcountered by Smogonbird and Aegislash (wow these two wreck everyone ban pls) and lack of a strong STAB to abuse that attack stat. His Bullet Punch is indispensible for destroying all Fairies not named Klefki - even Mawile is killed because unless it has Fire Fang/Fire Blast (it won't), it can't touch Scizor due to both STABs resisted and Sucker Punch failing due to being outsped.
Oh and Tyler I guess you could run Fire Fang if this guy screws you but I don't think its worth giving up a STAB for coverage against a select few.