The Stalker, Warlock, and Zealot have too much tied to 4th level talents. Like the Investigator with Studied Combat, these classes need the signature abilities that are unlocked at 4th much sooner than then.
Stalker has to choose between the critical Up Close and Personal, the very thematic Mockingbird and Throat Jab, or a rogue talent.
Warlock has to choose between Mystic Bolts and Arcane Training.
Zealot has to choose between Divine Training, Empower Symbol, and Life Bond.
Avenger on the other hand is not locked out of their thematic choices by a level gate at 4.
We really need to put more though into the talents as a whole and allow some of these at 2, never mind the whole spells as talents debate.