What if martians were to land on earth

Maybe they already have and they are living among us. Observing and studying mankind.

I think if martians landed on Earth they would be horribly disappointed in what they found (since they most likely set out to find intelligent life) and would leave as quickly as they came, moving on to the next planet. Or maybe they would make humans their slaves and dominate the planet. Who knows?

I would say that these creatures if they land on earth there would be many hassels and tensions and war like situations to create who is better