Just my own personal opinion. I'm not looking for anyone to agree or disagree.... In no particular order unless otherwise indicated.
Cheap Swill: Blatz, PBR, Natty Light, Stag (If its still being made. If so, this should more correctly be considered a regional. Blatz is also now a regional.)
Macro Brew: Labatt 50, Molson Export (in that order, and only in Canada, although 50 probably no longer qualifies as a macro.)
Regional Brew: Grain Belt Premium, Yuengling, Genesee, Dixie, Point, Shiner (Lager).
Micro Brew: Fat Tire, Boulevard, Sea Dog Porter, Edmund Fitzgerald Porter,
Imports (for North America): Chimay (all labels), Fullers (ESB or London Pride), Red Stripe, Samuel Smiths (Oatmeal Stout and Old Brewery), Lowenbrau, Guiness, Swan, Kronenbourg.