Nothing stands out because he's a pretty well rounded midfielder. He's energetic, his passing is good, he gets stuck in enough & he does read the game well.
Just because Carvalho stands in front of the back four it does not mean he reads the game well. I'm fed up with this notion that reading the game mean well in midfield means sitting in front of the back four & spraying passes about completely unopposed. Xabi Alonso & Gerrard have done it as their legs have gone. They don't read the game well because as soon as they are under any pressure they look knackered & players just run past them. It's all well & good when you're smashing teams (like Madrid normally do, Liverpool did last year & Sporting do in Portugal) as you can just sit there and do nothing.
Everyone went mad about Kroos & Schweinsteiger in the world cup, rightfully so, but Khedira was their best player against brazil & they missed him massively in the final. If you think he offers nothing in midfield & Carvalho does then you're just a blind fanboy. That's fine but just admit it as there's no other explanation.