Jurgen the German
Erik Thorstvedt
I just think its harder to score goals in the PL
Look how many forwards who flourished in Spain but struggled over here. Plus in recent times the likes of Forlan and Kanoute were average goalscorers in English football but were super prolific in Spain.
I don't think Ronaldo and Messi would bang in 50 or 60 goals a season in the PL
I think they would. Ronaldo for one has already done it in England! He scored over 40 goals in his second to last season here, and he's better now than he was back then. Messi and Ronaldo have both done it in the CL (top scorers in almost every season), which is a higher standard than the premier league ever will be so I have no reason to think they both wouldn't do the same in England.
Swings and roundabouts, Henry struggled in Italy but ripped it up in the premier league. Costa has been prolific in England. It's just most English players do not leave to play abroad, so there are more examples of foreigners failing in England than vice versa.