I was actually thinking about that comparison the other night but I think Lukaku is a better overall player. Maybe I'm not remembering him right but wasn't Gomez a fox in the box poacher with very little else to his game? I can't recall him before his injuries so maybe you're right but I just remember him scoring 40+ goals in one season for Bayern and a lot of them were really scrappy, opportunists goals (very effective obviously).
Inzaghi is another one of those players where you think, take away the goals and there's nothing there.
Gomez didn't bring much to the table other than being big, quick and a good goalscorer, but is Lukaku any different in that regard?
He didn't necessarily have a silky first touch, but I don't remember him being a meme like Lukaku. And unlike Lukaku, who seems to often just blast it into the keeper, Gomez was actually a pretty clinical finisher when his team set him up.