Voted 5, but I actually think 6 (0-5 instead of 1-5) is better. I don't like there being a perfect midpoint between the good and the bad ends of the spectrum, it feels like a bit of a copout... a score should lean in one direction or the other, if only slightly.
Personally my preferred scoring method which I use on Letterboxd, which really only works on an individual basis, is to use the entire spectrum of possible scores equally and to rate things relative to the other things I've seen. Effectively a tier list, with the caveat that I must use each tier equally and not just lump everything into the high tiers.