I think the poll results accurately sum up the perceived artistic effort of the movies.
Ghost Rider is the only one I don't own on DVD (and have no intention of buying it unless it ends up mega-cheap in the bargain bins)....so, for me, that one is worst. It's mostly because of what I believe was the hopeless miscasting of the lead role. Cage has been crap in recent movies - the remake of The Wicker Man was an absolute turd. Johnny Blaze needed to be someone more charismatic for whom the viewer felt more empathy. I'd rather have had Brad Pitt or some other hunky watchable actor than Cage's disconnected, wooden performance.
As for X3, I don't believe it's one of the worst movies ever. Singer and Ratner are opposites. Singer loves detail, subtext and careful thought, Ratner doesn't but instead he's a party-boy with a reputation for girls and fast cars and who likes fun, energy, movement, sheer entertainment. Fox hired Ratner and he didn't have much time to think about what he was doing even if he'd wanted to. What we got is a reflection of the rushed schedule and Ratner's personality. I expected a lot more... but I also think the movie was not a total disaster. Beast, Angel, Juggernaut and Multiple Man looked pretty good (as did Phoenix, though a shame about the lack of firebird), the action was visceral and realistic and not overly stylised, the colours were rich and warm, Storm had the most realistic hairstyle yet and she actually flew. Curing Rogue and killing Cyclops were the studio/writers' biggest errors...though Rogue's curing makes a kind of sense within the movie version of her character.
As I said, the poll results reflect the directorial craft of these movies, and seems fine from that standpoint.