Im going with warlock.
Reasons:
Huge melee reach
Self res
Shield on hit
Cheapest grenades
Blink (i know hunters have it too)
Cheap exotics
Just in general easy to use
Personally i think warlocks are the most handheld class in the game with how bungie designed them.
Also i main a titan and i give credit to hunters. Gunslinger has nothing good/useful besides the super itself in pvp. But yeah like i said warlocks are the easiest to use
Surprised i haven't seen that much "master race" comments
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Hardest are hunters. May be biased because I main one, but die a lot easier. Titans are almost as hard to use but lightning grenade is one of the most powerul grenades (easy multikills) which is why I think (Gunslinger hunters at least) are just a bit harder. Not to mention throwing knife melee isn't the best.