Exactly, like its any different settling from Serie A to La Liga, transfers don't work out all the time PL is no different. Sometimes systems make players look better than they are, sometimes you buy a player and the system he was working in got the absolute maximum out of him and the new system negates his strengths or sometimes he just gets homesick but all these factors apply to all leagues. Sure the PL has some unique characteristics but I certainly do not buy the old chestnut that it is that much more physical than say the Bundesliga/Ligue 1 etc. If anything many teams have forgot how to defend. On Zlatan with his physicality and also his ability to playmake like a 10 he would rip defences open and you would probably see a higher output out of Mata/Depay/Martial. Thinking about it, it is a transfer that makes sense on so many levels really.