Ignoring the lack of updates if the game is buggy, games back then were also more focused on quality and make gamers replay the game with unlockable features based on skills, not money. I can't count the number of times I played Metal Gear Solid games over and over to unlock new features playing the hardest difficulty and with handicap features, and also to find Easter eggs. Speaking of Easter eggs, you'd lose a number of hours exploring every nook and cranny finding them!
It takes two is actually one step further, only one player had to own the game. It takes two had what was called a friend pass which as long as you weren't the host of the game allowed you to play with any other player that had already purchased the game. So despite the fact that it was forced Co-op either split screen or online, only one player had to actually buy the game.
In this day and age it blew me away when I learned that because it's just unheard of now.