Just as the show as a whole, "Box Cutter" is somewhat overrated. The season four opener was entertaining and I was definitely excited to see the aftermath of season three's outstanding final scene, yet that didn't diminish the slowness and uneventfulness of it.
There were two big things happening in "Box Cutter", which I both expected to happen: first, Gale's death, which was doubted by an awful lot of people and second, Gus killing his sidekick Victor, which was utterly predictable considering the latter being seen at a crime scene just before and Mr. Fring being extraordinarily intolerant with such things. Granted, the unusually graphic murder scene that gives the episode its title is staged laudably well and offers the hitherto best performance of the ever magnificent Giancarlo Esposito. Nevertheless, it's overly long (I didn't look on my watch, but I'm reckoning ten minutes upwards) and, besides the oh-so-unexpected surprise Vince Gilligan appears to be so proud of, doesn't really present anything special.
After a phenomenal match cut going from Walt and Jesse cleaning up the bloody mess that Gus respectively Victor have left to some man at a diner dipping his fries into ketchup, there's another conversation worth mentioning, but that's about it for "Box Cutter". That's my opinion about Breaking Bad's return and call me pessimistic I'm already suspecting episodes as slow as season three's from this point on.