That's something that annoys me intensely (not aimed at you, just in general) - when he does, yeah. What if he doesn't find the same form as early last year though? I mean he's had plenty of chances in the last 4 games and missed them all (and complained and waved his arms about* when not everyone gives him the ball for an easy finish, mind). We're stuck with someone who doesn't score, can't trap a ball and can't pass consistently well. Just cuz he scored a goal won't excuse him if we lose 2:1 and he failed to make the simple through ball pass, or failed to even control a 20m pass alone vs. the keeper (etc etc, you catch my drift here probably).
But you're right about his application, still not an excuse for his lack in many other areas. We gave grief to Naismith for the same shortcomings Lukaku has, but Lukaku is apparently a superstar and Naismith was crap - lack of first touch, can't pass. Difference was Naismith ran his testicles off and Lukaku is excellent at direct running (as the positives for both of them).
*In the Stoke game - he failed the simplest of passes several times by not even hitting the player/the area in front of him or passing behind him (played it behind Bolasie or Kone, I think, and once for Kev as well) and then flailed his arms about and mouthed off the other player, as if it's his fault the pass was absolute toilet. I found that pretty annoying. Soz for the offtopic rant.