There were cheaters....cough..'exploiters' out there pre mod. I witnessed a well known member of the community using the engine off reset overheat exploit back before it was fixed, and was also convinced he was using the server console to help him locate players. This was confirmed when a sting was set up and he was fed data that shows up on console while I circled a remote area of the map, far to our sides rear to which he showed up.
However, the vast majority of players are cheat free, and those that do cheat are really only cheating themselves by removing any value to their 'achievements'.
There's always going to be cheaters in one form or another. Proxy programs to display
game data or fool runtime checks are more sophisticated and run outside of game code.
A cheater's game is weak. That's enough revenge for me