It also depends on what time of the day. Morning is fine, but I wouldn't do a 50 minutes connection regardless of the connecting airport in the US if the flight from MCO is scheduled to depart between 2PM - 4PM in August. Especially if seat selection is important for you for the transatlantic leg. A late incoming aircraft and/or the afternoon storm, and the connection may become impossible while still at the gate or on the tarmac.