Marathon,
ANYONE can hack Warband. It is the easiest game to hack that I own. Anything from replacing wall and item textures with a beneficial texture (such as see-through, or bright pink) is a hack. A single autoblock hack was detected and deterred, but that does not mean many other programs are out there that work just as well.
Are the best players in c-rpg legit? I certainly believe so. But, are there better-than-average players out there who are better-than-average because of the use of hacks? Absolutely.
Warband's best defense so far against hackers has been the low-key nature of the game. If warband was more mainstream, it would be riddled with hacks on every corner.