Goumindong
First Post
2) At higher levels, OAs becomes harder and harder to get because there is no way to have threatening reach in the game, aside from a paragon path for a 3rd party class written by Ari Marmell. Enemies can just teleport and fly around the defenders at epic levels, in my experience at least.
You can get 1/day encounter long threatening reach from the Polearm master Paragon path in Martial Power