To be honest I don't know why everyone is saying that Lennon's not been performing this season... I can understand why you do think that, last season yes he was better, but this season he's not been playing badly.
Look @ the circumstances, it's his 2nd season so most will know what he does by now and so many teams are doubling up on him. This makes it very difficult for him as he doesn't have the space to go round people - when he played for England in both games, he seemed to be beating everyone and so that shows that it is not his fault but teams are dealing with him. Well then you might say he's a one trick pony, well he has only just turned 20, what do you expect?!
Also Jol seems to be putting him on the left a lot, which makes it even harder for him as he can't do what he does best, in sprinting round the player getting an early cross in. Instead, he has to either go down the wing, and take his cross later, but by then he's gona get closed down. Or he cuts into the middle and get crowded out... You may also think then that it is Jol's fault but I think doing the right think for lennon. He's improving his allround game, while he's young. As Jol probably knows that his crossing/passing isn't as good as how well he can beat players. Also Jol is being cautious with how much Lennon is playing - which is a very good thing as I don't want to see him develope as an injury prone player...