I've gotta rep one of my all time favorite party games to this day (ported to PC) Worms Armageddon. They've had several sequels, but I believe that was the last one to use that particular physics engine, and every game since has just felt a bit... Hollow?

Also +1 to Paper Mario - S-Tier RPG, best of the whole series IMHO, tho the GameCube sequel TTYD is deserving of a very close second. I wish so bad they'd make a return to badges and acquiring new buddies and buddy upgrades throughout the game. The oragami king battle mechanics did not do it for me, and with it being the core mechanic of the game just soured my whole experience despite the rest of the game being pretty solid.