Mirror's Edge

It's an innovative game plagued by bad level design. Also, this game is unplayable if you are color blind.

The good about this game is the environment art. They created environments which are both believable and suit the gameplay by offering many opportunities to jump, wall jump, wall run, climb up and down and so on. The bad about this game is that level design leaves the path to follow hidden away from the player's view. This is a game of momentum and you are expected to run all the time. Yet, they made levels in which you are forced to stop and look around for the path to follow. It's contradictory. The runner's vision which highlights the path is a double edged sword. It doesn't show up until very up close. From far away it automatically turns off. The strong saturated colors are meant to help direct the player but they also end up confusing them. Very often the abuse of saturated colors ends up drawing your attention away from the main path.

If you want to learn level design, do play Mirror's Edge. Not because it's an example of perfect level design. It's more because you can learn from it by noticing its mistakes.