Lucky is also just okay and nowhere near the singles off the debut or Oops / Stronger.
It seems to have really resonated with a whole generation of people, mainly those who were young kids when it came out, and now means a lot to them, especially given the lyrics and what Britney then went through in the following years.
Even from a personal anecdote perspective, the amount of locals I’ve spoken to who unironically adore it is quite something.
Also, the video is gorgeous and invented Baz Luhrmann’s Moulin Rouge!