He played good as a defensive midfielder against two teams who were passive and constructed one attack combined for 180 minutes. His real value will show in games like the one against Napoli at the San Paolo.
Vidal was excellent technically. His skills and endurance are in a different level above Nainggolan (and everybody else).
Anyways, Lemina is still unproven. So, no need to start comparing him with the likes of Vidal and Nainggolan.