I bought this card because his stats caught my attention due to his 90 Pace and 92 Dribbling. I tried this card in 12 games as an ST (10 Fut champs games) and Mertens has scored 19 goals and has 6 Assists. So far he has been very good and reminds me of Messi due to his dribbling ability and inside of the box finesse shots and his passing. His shooting is near Messi level but just lacks a bit to be at that level. He has 90 Pace not really much to say other than yeah he is fast. He has good Passing ability and from how he plays at ST I think he would work wonders at CAM and honestly, this card is very versatile as I believe he'd probably be able to play ST, CAM, LW, and RW. With all of that being said I have explained his pro's but let's talk about his cons. Physicality isn't important in Fifa 20 as having 60 Strength + Aggression would be fine but his physicality is so low (40 Strength) that once he has someone trying to put their shoulder on him he gets intercepted almost 7/10 times. This is one of the stats that I think really sticks out. (This is what distances him from being Messi class or on that level).
Versatility can play many positions