Good goal off the bench. He is being used much better now under OGS.
Under Mourinho he had the same status as RvN (2001-5), Rooney (2004-12), Ronaldo (2005-09) and although brief RvP in 2012/13. By that I mean a player who we build a team around and is a guaranteed starter week in week out.
We've had plenty of good strikers aside from the above under SAF who weren't given that luxury. Tevez, Berbatov, Saha, Chicharito (even Forlan and Welbeck) etc who were only first choice and certain points in time, despite being great players. I see Lukaku more in that second category and even then I think he struggles in comparison to the above.