Is this the most charming version of JCVD?
Van Damme is so likeable in this movie. It's got nothing to do with him being the hero either. There's this innocent charm stemming from the amnesia/memory wipe, he plays it perfectly.
He has the funny one liners in all his interactions with Ally. And his smile, that damn smile after he beats up all the bar patrons, and Ally asks him how was lunch, he just looks so satisfied.
He may not be a method actor, but he just has this almost unexplainable on-screen presence and charisma. It's why he was such a big star, he has 'it', and it's why other action stars with more talent don't make it as successful as JCVD. You can be a much better martial artist, say like Scott Adkins, but people just don't like that guy as much, so he'll never be a box office draw.