At the time, Vinnie Jones was still known as "hard" in Britain.
So they had to do something to appeal.
Why not make him the one guy who could take out super Wolverine? Every single trailer shown here had him either knocking Wolverine when he charged. It was obvious pandering to selling the movie.
As for he was bad: it's Vinnie Jones, he can't act outside of "I'm a former ex-footballer who thinks he's a gangster, cause I'm hard".
The character itself was, like most of the characters in the franchise outside of Magneto, Charles and to a posssible extent, Shadowcat, given to actors that did not go well with their characters at all. Wolverine is a tall handsome charming and polite man. Scott is now "I have no personality or care about anyone", Jean is no personality, Storm is no personality, etc.