Yeah but it doesn't stop him from just maxing E first like any smart Pantheon would do and just wrecking you with it
TOTAL PHYSICAL DAMAGE AGAINST CHAMPIONS: 80 / 140 / 200 / 260 / 320 (+ 360% bonus AD) in .75 seconds
heh
You'd better buy a lot of mana pots if you go E max, because of the higher mana cost. Also, your all in will be stronger, but your harass will be weaker because of E's much longer cooldown. You also have the problem of getting off the full channel, you either need to use W, or they have to stupidly walk right into you. The W + E combo costs at least 100 mana, and only gets higher as you level. You can get a lot more consistent damage and harass off if you max Q first, for a better mana cost, and less cooldown gating.