Just because he's a BPL player and plays for Chelsea, a team led by Jose, doesn't mean he is overhyped or overrated. Tbh, the BPL bashing right now is just as annoying as the constant overhyping on their parts during their glory days.
Oscar has similar qualities as Turan, who is supposedly a great fit for Barca - namely work rate while being technically impressive with the bonus that he's a lot younger than Arda. Also in terms of off the ball movement he brings Müller or Rakitic-esque intelligence in that he is able to perfectly balance attacking runs from his teammates. Only his end product is rather inconsistent and sometimes underwhelming, but Turan's not really better either.
Then again people here claim that Arda Turan is a superior player to Arturo Vidal as well. Just
How does one compare those players? One is an attacking midfielder and the other a goalscoring winger. Doubt very much Pedro would play in Oscar's role.