well if they could speak in most games, i doubt they would say something much different than XBLA and PSN users. The behavior depends on the game.
Mostly, they are honorable.Some do cheat in specific games, like MKW but are just a tiny minority compared to the vast playerbase. I dont complain much. I think TC was pirated heavily because it has many more hackers than COD reflex, a game that sold many more copies yet is much harder to find a single hacker. So certain games, that are too pirated AND online, often show poor online sportmanship.