Personally I had too many problems with this episode to like it. Yes, Derpy was awesome and made the second half at least a little more watchable.
But I have too many questions when it comes to this episode.
If you are qualifying for the Equestria Games, why choose two of Ponyville's worst fliers? Is there nopony else who wants to be on the same team as the fastest pegasus in all of Equestria?
And Bulk Biceps, I don't know why but personally I can't stand him, sure he's a little fun in very small doses, but an entire episode dedicated to him?
Oh, well, one can't like everything. So far season 4 still has been a wonderful ride!