You guys can say all you want. Orianna's popularity has grown significantly (by 5%) since October 5th. However, the win rate with orianna continues to stay the same (at 45%). Not sure about you guys, but it doesn't seem like the rise in popularity really changed anything. There's still more loses with this champions than wins. No such "overpowering" that people says exist have been reported.
Like many have said, Orianna is a team-orientated champion. She can only excel if her team does well. If not, she is just a hollow body. Also, she can be easily countered in laning phase with dash champions. The control of the ball and movement of the champion at the same time causes Orianna a hard time in dodging champions like Xin or Kat.
Btw, source of those statistics are from lolking.net