I'm the only one who will tell you the truth here.
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Fifth Element and Leon are Besson's best movies.
Nikita is alright, I consider it director's 'very early low budget' period, along with Subway, the one you explore after liking something from the director, appreciating it, but ultimately never loving it as much, as whatever drew you there.
It's nowhere as good as Leon, Anna is better, Lucy is better, and I actually prefer the remake Point of No Return with Bridget Fonda, but Chinese version Black Cat is good too.