I personally can't put Glen Johnson into the ''flop bracket''.
I'll tell you why.
The answer is Kenny Dalglish and the emergence of Martin Kelly.
Glen Johnson with the emergence of Martin Kelly has had to switch to left back,and due to the fact its not his natural side he's had to become more disciplined.He can bring that into his favoured right side.And he was superb at right and left back against Man United and other games with the exception of the west ham game,when the entire team was dreadful.So he can't be singled out.
If he can remember to be as disciplined on the right as on the left,then he will be a valuable player.