Downside to the new Exp Share Pokemon XY?

[Dr.EisDrachenJaeger]

You dont get EV's from EXP share. You're over leveled but you're also weak.

And horde battles.

Considering the pokemon trainers utilize competent battel strategy in the actual game, XY and very good.

 

And yes the gaps between teh 1st 2nd and third gym is huge.