Personally I think absolutely.
Automatic, 2 hit kill pistol which you don't even have to aim. It has good range, stability, accuracy, and glitchy damage which jumps up too high.
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As someone who mains last word I will say Last word is overpowered just due to its kill time potential, but saying it takes no aim is idiocy. It has one of the lowest aim assist stats among all hand cannons in the game. If you play with last word for a few games and then switch to thorn, which has one of the highest aim assist stats for hand cannons, you'll notice a huge change in your hit detection.