1. Players weight, speed e.t.c actually affect the gameplay.
2. Weather conditions affect gameplay e.g rain - passes are harder to control, players find it harder to balance, makes first touches bad e.t.c
3.Gameplay
4.Kits, leagues e.t.c
5.Offsides... it would actually be good if the linesman did get offsides wrong now and then instead of getting them perfect every time. This would make game play better but could get annoying if your onside and get called off.... but at least its realistic
6.master league - manager needs to be better e.g loans and also using currency and not points.
7.free kicks - basically every player can score a free kick, and when ever the comp gets one 7/10 times they will score. This needs to be sorted out.
8.sounds - commentator, crowed e.t.c need to be improved
9.animations - better tackles, throw-ins, movement of players better, shooting, passing e.t.c
10.throw ins - no invisible bubble holding your player back to come closer...
11.More skills
12.Make the pitch bigger
13.Could take part in warm ups before the match if you wanted, a bit like in fifa 08 when your just one player and one on one with the keeper but its before a match and you practice corners, free kicks, one on ones e.t.c
14.better referees - you get the smallest tap in the penalty box and your awarded a penalty it's like wtf??
15.online fixed
16.updates - have a download for offline and online where people can get all the latest transfers.
17.players stats - these are really unrealistic
That's about it but most important is the gameplay, so if that's improved it would be great