I don't really know to be honest, I just like the character. In my opinion I think that visually he looks interesting. I also like his personality and feel that it works for him as a character. Like I said, I don't think that he needs his own series but I have always enjoyed Gambit.
Don't underestimate those things you described -- these are still comic books. This is absolutely still a visual medium. Gambit's look is distinctive, his personality is distinctive, and depending on the creative team, I absolutely might read this.
This is a character who could be what Wolverine used to be, before he became The Killer Who Can't Be Killed: A character who exposes a darker side of the Marvel Universe, uses methods that are questionable, but is still a hero.