Zherdev had the ability to be so calm and casual with the puck on his stick. Unfortunately, calm and casual also describes his approach to backchecking and overall defensive play. When he's producing, you can ignore those shortcomings somewhat. But, he's also inconsistent, so when he's gone cold offensively, you want to send him to Siberia.
And on the topic of Enver Lisin....
Well, let's just say if you removed Chris Kreider's brain and replaced it with that of a squirrel, you would get something awfully close to what Enver Lisin was for the Rangers. Smooth, powerful skating, decent height/frame, great shot, but absolutely no idea of how to play in the NHL.