By level 12 his mres per level makes up the difference, after that he's stronger than before. Do you know what viciously means? Or nerf?
Considering Athene's is the first item you build you should have it way before level 12 and by the time you are level 12 the MR isn't really as much of a big deal as it is early on in the laning phase. And I haven't even mentioned the mana regen aspect of it yet.
Basically loses a ton of laning power
A ton? You can tone down the hyperbole, it's really not that big of a deal. We're talking like single digit, low double digit numbers here, Galio's got swag, he'll live. --- http://i.imgur.com/6AzSxys.gif