I for one can't stand the big name beers - coors, bud, etc. I find them to be mostly tasteless and cheap, catering to the college crowd looking to get too hammered to remember. I see people walking the streets around the uOttawa campus during summer carrying case after case of the stuff. Blecch. Of course, being a student at that selfsame university probably makes me a hypocrite!
I prefer darker beers. Rickard's Red or Guinness in a pinch, although my favorites have to be Caledonian 80 or Leffe Brun (which are hard to find sometimes - not even every LCBO stocks them). Delicious.