Given his fair share of development Stancu will really turn it on by season 3.
A lot of people expect him to be great straight away, but he is young and undeveloped at the start of the game so going straight into the Premiership is a bit too much. He's best suited to lower leagues for a couple of seasons while he develops.
My game with Nottingham Forest is a good example - he was top scorer in League One in my first season, then again in the Championship, and very good (but not top scorer) in the
Prem in season 3. I'm not in my 6th season and he's arguably the best striker in the league and scores almost every game. Don't give up hope but don't expect wonders for another season or so!