If I may jump in, I'm a DC United Supporter and have seen almost every minute of his play this young season.
Freddy has started all but one game this year and has been impressive. He's tracking back well defensively, setting up a number of goals, and breaking ankles when marked one v one. His free kicks have been generally dangerous, and he's getting more of them. He hasn't scored, but it seems to me when he gets the cover off the goal, he will fill it.
HOWEVER
Freddy just turned 17 (Like, last week). While he appears bigger and stronger than last year, he's still too physically immature, particularly in a rough league like MLS. He also needs to improve his work rate, and his right foot. He does NOT have the blazing foot speed some thought he had. He can burst, but not sprint. He's been used on both wings this season, and spent a game in the center, holding his own.
Freddy has unique vision and touch for an American teenager but is not yet useful to an International team. He would also struggle with any level of British teams, because of the phsicality. On the other hand, he could contribute in Spain or Holland, where they seem to give you a bit more room. After his 18th birthday.