This has honestly been the year of the flop, and in the grand scheme of things I actually think Beyond: Two Souls did much better than the vast majority of other titles.
Take your pick from multi-plats like Fuse; Army of Two; Lost Planet 3; Remember Me for bigger flops.
Take your pick from exclusives like Wonderful 101; Puppeteer or Killzone Mercenary for bigger flops.
So no. I wouldn't say Beyond was flop of the year at all.