Towers and Super minions!
Towers currently are paper thin, and don't protect against dives when you build the slightest amount of armor. Super minions do way too much damage and there are way too many.
A long time ago you could make epic come backs if the enemy played stupid but now if you try punishing them for playing stupid the 1 super minion tanks both towers long enough to lose 1 if not both. It feels especially bad to play a support because good luck autoing a super minion with 4.5k hp till it dies. Seriously why do they have that much health?