He looked pretty naff for the first 3/4 months while he was mainly a sub butLong brings a lot to our game - pace, movement, great ability in the air and the fact he knows how to battle and win a freekick to take pressure off the team at vital times.
His finishing, as highlighted by others is by fair his weakest part of the game but again he would be a 30m + player if he could do that too.
A reason why I think its too early to write off Juanmi - he is/was highly rated in Spain but must be hard to impress with a lack of game time.