I agree the warlock jump is poor, I main Warlocks, but frequently run both hunter and titan. Bladedancers have been nerves a bit, their arcbolt grenades are completely broken (throws flux instead) and if Titans have a weakness then it's definitely that idiotic melee.
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Warlock jump is really good at giving a quick boost out of cover by triple tapping the jump button. Got more than a few unfair melee kills against rushing people by doing this.