Best beers, no particular order
Staropramen lager, great all-around beer, tastes good to food, by itself, with snacks, etc, you can't go wrong with Staro.
Urquell, pretty much the same as above, only slightly more bitter, might as well share #1
Hell beer, Swedish beer, very bitter, I love that, don't drink too many, something like 4 or 5 is enough before moving to something else, kinda reminds of Sam Addams, only more bitter.
Westmalle Tripple, Belgian Trappistes, damn good stuff, the cons are the high price and low availability.
Rochefort 10, same as above, though not quite as tasty, still damn good though.
Duvell, Chimay Blue, Grimbergen, all worth it, they're all good, just not as good as the above.
Bishops Finger, Spitfire, etc, a bunch of bitter ales, all very good.
Worst Beers
Budweiser(the American kind), as my father said, "Beer for women with bad teste"
Corona, pretty much the same as Bud, only not quite as bad, if you like water with a bit of beer in it, by all means, go ahead.
Pretty much any 7.5+ precent generic beer, some people(Belgians) can make beers that are strong and good, most people can't, and they should realize it.