On the opposite spectrum of simple exploits by jumping, we have Tribes. In the original game, people quickly realized you can exploit the physics engine by jumping, allowing you to quickly traverse the terrain. It became known as "skiing".

The devs, rather than patching it, incorporated skiing into Tribes 2 and has been a staple ever since. And also, while Counter Strike has become a massive success and has thousands of players today. Tribes (while it was successful at the time) has become a niche game that quickly weeds out newcomers and hardly anyone plays it anymore.

Not saying that there's a correlation, I just find it amusing.