Alright, I think we can say that SOME percentage of the human race will be interested/curious at the idea of first contact and have a peaceful reaction to such a thing. However, you also have to take into account that a much LARGER percentage of the world holds prejudices to one group of people, or more. Some of us will think, "Hey, cool. Aliens have reached Earth. Maybe they can teach us something. Give us a piece of thier technology. We can learn from them and, therefore, grow as a species."
Mankind is prejudiced, violent and paranoid by nature. We kill each other over land, money and minor differences in skin, religious belief and sexual preference. We've had wars started over rather ridiculous reasons. You take powerful world governments like the so called "super powers"--the same nations that have invaded other countries for oil (FREAKING OIL, FOR GOODNESS SAKE!)-- and expose them to aliens, they're most likely going to react in a rather violent way. They'll probably see aliens as they've been portrayed in H.G Well novels and Michael Bay films--bat sh*t crazy invaders that seek no more than to destroy us (ironic, eh?) And our response will be to fight back.
So I'm going to have to side with Newblaze, NateSean and RussianSpy on this one.