The whole Everton team was outclassed, but Coleman made the same mistake every time which left the defence very exposed, considering that all Benfica's play was going down the wings. Every time he got the ball, Coleman was looking to beat a man or bomb forward, but when he did, he either lost the ball or was caught way out of position and seemed lethargic in getting back into position.
I hear a few people excusing his performance by saying he's out of position... full back is full back, Coleman was just all right foot tonight and at this level, not being able to use both feet is a weakness. Gosling was similarly poor and but he's not a defender. I think Moyes might have had better luck had he actually played a centre half in Duffy with Distin and let Hibbert play in his natural position. Coleman looks like he either needs to get back to full fitness or work on his game. Maybe a loan move after Christmas would benefit him?