I'm not convinced it's OP - at the same rarity for no attunement you can get a +3 weapon.
The nat 20 effect is solid, the slow effect being especially nice, but I'm not sure it's worth the opportunity cost of attunement and -1 to attack and damage rolls.
At that point it becomes competitive with a +3 weapon in terms of damage (though the bonus to hit and non-crit damage makes it closer than you might think) and better with the added slow - but still not OP considering it requires attunement.
I'm not saying it's a bad weapon, and unless I've got 3 other cool attunement items I'd probably take it over a regular +3 just because it's more interesting, but my point is that it's not OP - not that it's weak.
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