Blinkstrike has more range than warlock's melee, first off.
Titans have the shortest, at 3 meters, blink strike is I think 5.5 meters, and Warlock's are somewhere in between (but closer to 5.5).
New Warlock's subclass gives additional range to Warlock's melee, which will probably tie Blinkstrike's range.
[spoiler]But throwing knife has the most range, derp.[/spoiler]
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Actually I've seen a test that showed that warlock base melee range is ever so slightly longer than even blink strike range.
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Blink strike is the farthest...but that's blink strike charge Not just the knife, which is slightly further than a titan punch (throwing knife was nerfed to not a melee status) Warlock...poof...is consistent, with or without a charge.
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Warlock melee also had the longest animation, which sortof balances it.
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Until you get a helm or gloves with increased attack speed