I agree with most of Ref Fan's post. Oliver had a good/expected level performance on a Normal difficulty match.
His decision making was good (only a couple of fouls missed plus a YC around 81-82). He had control of the match despite the excessive dissent at VAL penalty appeal (No handball, Oliver awarded an attacker's foul -> correct IMO).
The biggest issue was the 4-0. IMO, the offside is punishable even though the player in offside position doesn't come in contact with the ball.
The only point for improvement would be his positioning (too close to the ball at times, no diagonal movement).