I'm going to recommend some of my favourite bands right now and NOT be a stereotypical forum goer and argue what and what doesn't classify as a) good b)punk. These might deviate from the label "punk", all at their own respective degrees, but they've all got punk elements in them and are generally enjoyed by punk fans.
Jawbreaker, Jawbox, The Lawrence Arms, Misfits, Closet Monster, At The Drive-In, Cap'n Jazz, The Methadones, The Jam, Alkaline Trio, Turbonegro, Sleater-Kinney, Bratmobile, Hot Water Music, Small Brown Bike, Blood Brothers, Iggy & The Stooges, Adolescents, Pretty Girls Make Graves, Propagandhi, Shellac, Shiner & Television.