Just an FYI in case you didn't know: the game highlights key and preferable attributes for various roles and you can search for these attributes too in player search. Pro tip: Don't search via highlighting a position, just the attributes you want, if the player doesn't know the position, you can always retrain him there (comes with a penalty , a little loss in his ability supposedly and sometimes they are really bad in learning a new position, but for me this trick is worth it overall, especially if you are a small team - or on the rise and desperately looking for players etc)! Having said that, underrated attributes by people usually are: For keepers, communication and command of area, I mean reflexes and one-on-ones are nice but if you don't even have to sweat, it's even better. From physical attributes, agility and acceleration (especially if you want them to sweep). For defenders, composure, dribbling, first touch, technique and passing is good for them to actually keep the ball, despite not being mentioned for some roles. The best defenders in the game are good offensively too, in addition to the usual defensive capabilities (Decisions - important for all positions , positioning , concentration, marking , tackling , heading and anticipation and of course all physicals). Teamwork is also very useful for all positions and many times underrated too. For midfielders for sure work rate is important, especially for those in central areas. Also stuff like vision and flair can't hurt, they are useful for breaking the press alongside with decisions. For wingers or strikers, aerial and balance are often underrated, stuff like jumping, heading, bravery etc. This however depends on how you play, many times a short forward or winger can be useful too. Those on the top of my head, if someone wants to add something / correct me feel free to do so.