C4 Jumping - I love it! It's an exploit sure, but a purely intentional one by the programmers. Plus it's available to every player(FF-off(friendly fire) of course) and doesn't require any special knowledge to use. Do you think it's considered "cheating"? I would have to say yes, but ONLY if you are playing on a server that has made it clear that C4 jumping is not allowed. Other than that though, I think it's fine and heck of fun to research some new areas on the map.

Best Map to use: Strike At Karkand

How to: Make sure you chose Spec-OPS, throw C4 before a building get detonator while running over the C4 press detonate and off you fly my friend. Enjoy!