Warlock melee is different from Titan melee. Warlock base melee is slower and less powerful with a longer range than otbef classes, and the melee ability is a ranged type. It shoots a projectile towards an enemy, freezing them. The problem is that the range after the nerf is so little that it the margin between missing or using the regular melee is too small to reliably use it. In Titan terms, take your shoulder charge and say it got nerfed to the point where you have to be so close to the enemy that you almost run into them. From my Titan I know that using a shoulder charge too close to an enemy means you probably fly past them and miss. Yet if you are any further away, your charge wont reach the enemy. The margin of success is so small that the use of the ability is very limited.