Pantheon's E first-cast needs to do 150% AD.
Or have some kind of base damage on the stab. 'Cause even with his level 1 AS, the DPS doesn't match auto-attacking. And yeah, you can pop it after 0.3s, but that defeats the purpose of having the damage immunity against monsters.
It's just not right that his level 1 attack speed beats his E for dps at all points in the game. Either it needs this, or it needs to actually have a base damage on that part of the ability.