What are the best couch/local co-op PC games?

Every single dialogue line in D:OS2 has a voice-over. From the prattling of an overzealous city guard, to the lines a sketchy shopkeeper feeds you, to even the conversations you have with forest animals. You even get a narrator to read out long walls of text for you. On top of that, each and every voice actor's performance is superb, providing depth and nuances even to obscure side-characters, which is hardly ever experienced in games.