Quote Originally Posted by Matrix_Walker View Post
You mean Mid-level slots. Warlocks never get high-level slots.
At 5th level the high level slot is 3, at 7th level it is 4, etc. Warlocks follow the same progression for high level slots as other full casters.

They still get them after 11 too, just not as many. Since the majority of the game takes place from 5-10 and most groups don't go much past that I don't see much of a problem with it. By Tier 4 the Warlock is probably falling behind, but game balance is all over the place by that point and it represents a very small amount of game play that it doesn't really matter.