Landfall only works if the Warlock manages to get right next to you before activating the super. They have to do that without blinking (Stormcaller can't blink unless they are already in their super) and with no overshield/damage reduction. If they manage to do that, then you are boned. Once in the super, the Stormcaller again has no overshield/damage reduction and so can be taken down by the same number of bullets as a normal Warlock. Yes, they can blink and be hard to hit but they are vulnerable. All that being said, I actually do agree that the super is a tad too long. You really shouldn't have multiple times that you can be killed, respawn at another location on the map, then get killed again by the same super. This seems to happen a lot. I main a Warlock and rarely use Stormcaller in PVP. I find it to largely be a suicide class. You may get some kills with your super, but I almost always end up getting killed in the end. I prefer my long-distance void bomb.