Well, surely unrealistic things happen. That's been established ever since we've been told about afterlife, hell, and souls wielding swords. Plotholes have been rife right from the beginning if only we looked closer (Shinigami need food, there are "families" in Soul Society etc).
While Bleach's premises aren't novel, Kubo has masterfully built a new world for us to dream and imagine in, and that's really the aim of any Shounen. Sure, we've got the swordfights and epic releases typical of any self-respecting series. But Kubo has also built up, bit by bit, our understanding of Soul Society, the thirteen court squads, Hueco Mundo and even the human world, and I think that deserves a bit of respect.
Like most of the reviewers, though, I myself have been quite frustrated by recent happenings. To me, it all went downhill ever since Ichigo killed Ulquiorra - evidently, Kubo isn't even willing to play within the rules he set. But it can only go down before it goes back up, and the recent chapters have -somewhat- redeemed the whole Fullbring fiasco. In my honest opinion, the only way to rectify Fullbring is to erase every single last one of those idiots and prepare some history of Ginjo that might actually be relevant for the final arc.
But let's not be too harsh on Kubo. Sure, he's made some silly fights: Hitsugaya's ice clone, Aizen pwning Yamamoto and everyone else flat, Ichigo saving the day (how unexpected). But we should credit him for the epic battles, from the Byakuya v. Ichigo on Sougyoku Hill to Grimmjow v. Ichigo and (yes) even Shunsui v. Starrk (though it'd have been nice to see his Bankai). And no one will deny that Barragan's release was just... Godlike. So, all in all, a deserved 8.5, though it could have hit 10 with more real character development (I'm only satisfied with Rukia) and less meaningless and counterproductive power-ups (bloody hell, kill Ichigo already!)