I wouldn't call a 7 hour game short, I'd define that closer to 2 hours. The reason it's bad is that they usually fail to fully explore whatever idea the game is

I wouldn't call a 7 hour game short, I'd define that closer to 2 hours. The reason it's bad is that they usually fail to fully explore whatever idea the game is built around or they never really had an idea good enough to carry an entire game.