That's something that happened last year as well. The concept player show chemistry as if they already have the one loyalty bonus chem, which if you buy them, they don't have. Very annoying.
I played 12 games yesterday, winning 8 and losing 4. The defeats were on penalties, or by one goal, whereas I was winning by scoring stupid amounts like 9, 7 and 6. Built two teams, one 433(5) and one 4231(2). Top scorer so far is Ilicic from false 9, with 9 goals (and 8 assists) from 6 games.
The games were quite fun, but give it two weeks when weekend league starts and people start to have some sort of clue what's going on in game, plus the game is on full release and the button delay and lag inevitably starts, then I don't know what'll happen. There's already signs that diagonal cross pitch runs are very difficult to stop if done right. Add any sort of problems with lag or delay into player switching and it would become a pacey mess. That's my biggest concern so far.