It depends on experiences I'd say. My personal experiences with AC would have me voting it best North American airline in a heartbeat. All my flights have been on clean aircraft, with friendly flight attendants (Yes even the Quebecois ones), on-time even early performance, excellent entertainment with fantastic radio selections and great CBC tidbits, sitcoms, and "interesting" movies (sometimes AC seems to go out of its way to find the most obscure movies out there, but they can be enjoyable), and fantastic, fantastic, fantastic food.
My last flight on them was MIA-YUL and back, and going up was a "snack" flight, but my snack was a chicken caesar salad, with a nice sized chunk of chicken, some cold macaroni in some creamy, tangy sauce (yummy), fresh fruit cup, and a cinnamon roll. The return flight was a breakfast one with an absolutely delightful omelette. The best part: Who doesn't love EnRoute Magazine? Always a great read, and they usually have nice stuff for sale through their inflight, duty-free boutique.
What am I looking forward to on my next AC flight? I'll be old enough to drink (I'm 19 come sunday)! Tell you what, when we get airborne I'm ordering a Canadian beer or two (blasphemy but I've never had a Molson or Labatt) , an a double helping of some Crown Royal if the have it, after all who can fly on just one wing?
AC seems to be striving to improve it, as its new cabin interiors and new Executive First service product demonstrate, I say in 5 years they'll be lightyears ahead of where they are now.