More often than not bland presentation and mundane interaction spell doom for a new video game IP. That said, there are a few titles which distinguish themselves without either of the twin pillars of beautiful graphics or engaging gameplay for support. The ways these exceptional oddities stand out is through shear imagination.
So, there are three games that have neither impressive graphics, nor particularly compelling gameplay. However, they make up for it with intriguing premises and a lot of creativity. While I wouldn't necessarily call any of them great games, I do think they're worth a look-see even if that only entails a "Let's Play" on Youtube or some other equivalent video game footage hosting service.