My opinion of this movie can be judged by my avatar.
Seriously, though,
Leon is a brilliant movie, and one of the best crime dramas ever. Fantastic performances all around (especially from Portman in arguably the finest debut performance ever pulled off by a child star), with Oldman as one of the most underrated villians ever. I love it.
I'd actually love to see a sequel made that continues Mathilda's story.
Entertainment Weekly came up with Mathilda returning to Leon's boss (Danny Aiello) to take over Leon's job and get her first hit. Portman says she'd be open for it if Besson directs it.