I try to look at it by how the real life teams use the players. The Broncos have experimented with using Champ Bailey at WR. He MIGHT play WR at most 5 plays, if even. Those players that abuse Champ are the ones that line him up every play. The same goes for the players that abuse the Raiders. In Madden 2008, they basically put all the CBs at WRs (Washington, Asimougha or however you spell his name, Routt, and etc) That is obvious cheesing to me without taking advantage of the game's engine. I think there's two ways to cheese: exploiting a glitch on the game's engine and not playing realistically ie. CBs playing WRs.
I do not have a problem with Bears fans playing Deven Hester at WR. Because in reality, the Bears really are trying to develop Hester into a top flight WR. I would actually have more of a problem if people put him at CB because he frankly does not play that position anymore.