Shining Armor held a force field up that was bigger than all of Canterlot for several days and nights, all while being love drained/mind-tweaked by Chrysalis, managing the royal guard against a top-level threat, and helping to prepare his own wedding where he could. That force field could stand up to an entire army of Changelings battering at it even in its last moments of strength, yet was still pliable enough to allow specific entrances and openings on command. If that’s not OP, I don’t know what is.
 
Oh, wait, no… Cadence radiating enough love to cover an entire freakin’ kingdom all on her own for several days. I don’t care if she is the Alicorn of Love. That’s some hax right there.