I'm not sure that it's objectively the worst remake (it must be close) but as someone with a great affection for the original, I'd vote for the Travolta and Washington "The Taking of Pelham 123".
Death Race 2000.
I can't event figure out why they remade it.
Having recently rewatched the Carradine one, I agree that it's unclear why it was remade, largely because the original didn't strike me as great work either. At least the remake has Statham, and lacks Stallone.
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Judge Dread is pretty much a carbon copy of The Raid, just set in a bigger block of flats and both are decent films.
Dredd was written before "The Raid", afaik, so that should, perhaps, be the other way around (although in truth, both films seem merely to have had the misfortune to be in production with similar premises at the same time, to the detriment of "Dredd", sadly). Dredd is a decent action film, and a bloody good Judge Dredd film, having twigged that capturing the spirit of the character and the strip mattered more than slavishly replicating costume and props to the comic blueprint.
In other fora where I've seen this hashed out, a 1987 film "Enemy Territory" is sometimes brought up as the true antecedent to both The Raid and Dredd.
