You know what's the fun part about playing a mage top?
Enemy champion completes
.
Congratulations, now they win every trade, despite you being several kills ahead of them, thanks to the free damage and stats in their kits.
Meanwhile, your damage becomes nonexistant. Especially when playing against something with sustain. Just had a Nasus. Me and my team were totally crushing him, making sure he doesn't free-stack. Guy was 0/6/1, but WOOOPS, he was stronger than me, the moment he completed the item and got a Sheen.
I usually have no problems playing against most toplaners, but the moment they can buy SV without really missing any damage it's just not fair anymore. I know there needs to be an itemization against AP-users that use their range against melees, but this is total overkill.