Because of this combination of skills / perks
[u]Arcane spirt +divine order[/u] : this combination gives you 80-90% of the bar filled in both armor and recovery( reduses agility to about 15-20%
[u]energy drain[/u]: normally only reduses your grenade cool down but is augmented by other abilities.
[u]Embrace the void[/u]: where it starts to get fun. Damaging enemy's with your grenade / nova bomb triggers energy drain
[u]life steal[/u] killing a enemy while energy drain is active restores a " significant portion " if your health.
[u]the hunger [/u] extends the duration of energy drain
With these abilities you should be able to tank very well
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I think it'd be best to describe the warlock as an off tank. Their mobility and regen should help them keep aggro on adds and their AoE should allow them to clean them up as well. Titan has damage mitigation which is where tanks usually shine. A boss that crits like cray will still drop someone that doesn't have any mitigation. Not to mention the Titan has group buffs to shields and such which will really let the 2 work in tandem. So far hunter seems pure single target dps as well. I feel as though the game may hopefully shine when we have lvl 20's working in tandem to get the synergy between everyone I think Bungie was going for.