Sick of feeling handicapped as mana mid vs. non-mana mids
It's an instant handicap taking a mana mid, a la Ryze, against non-mana mid, a la Zed. You're not only constantly micromanaging your mana output, but you will likely have to back to fountain before he does. Just absolutely ridiculous. There is nothing in the game that makes mana regen at least on par with energy champs.
And don't even get me started on yasuo mid, who not only does not have mana or energy, but a double passive to shove down our throats.

basically waveclear better than mages at all stages of the game now,especially early,forcing people into even MORE uniteractivity and waveclearing since it's so fucking oppressive to get cheesed on mid levels 1-2. Riot Assassin bias anyone?
when trading for longer. They just wait on their cooldowns to use it all again