Some that come to mind, and merely in order I thought of them:

• Danger Five
• Green Wing
• Blackadder
• Clone High (Edit: should probably be AtlA, but I’m holdin)
• Puella Magi Madoka Magica
• Cowboy Bebop
• Flight of the Conchords
• Inside No. 9
• The Wire
• Atlanta

Only finished shows considered, as a poor ending can ruin a show.