Now I think that Inter are much stronger with the Lukaku transfer. Even if it is a loan deal I see it as good for them. Because I remember the season Conte's Inter had and won the Serie A title. In that season Lukaku and Martinez both showed incredible performances. They were a superb duo I mean. Therefore I'm expecting to see the same thing again.
Lukaku ever experienced a great season with Inter Milan previously, but no guarantee to repeat. However, he has the chance to give his best again and helps Inter Milan to achieve its target for the next season. Not sure he will experience a great season again with Inter Milan, but having Lukaku surely makes Inter Milan attacking stronger. Inter has many options for attackers but relying on the duo Lukaku-Martinez isn't a bad idea. I agree that Lukaku and Martinez are the strongest strikers that Inter Milan has for the next season.