To be honest, we're pretty uninteresting right now. I mean, we're still in quite an early stage of development, we've been around for a very small amount of time, and while we might think we're progressing fast, or indeed slow, we really have nothing to compare it to.
I won't discount the possibility that there has been contact, or attempted contact, but I obviously remain questioning. Who's to say they'll land and say hi? Would they even have a vocal language to speak of? Maybe, as in the video, they'll try to contact us through signals, or lights that seem bizarre to us. We shouldn't be so arrogant as to think that if they don't make contact in the way that we'd like, that they either don't exist, or that they're dumb.
Who is to say really? I guess we'll just have to wait and find out. Hopefully we'll not have blown ourselves up by that point, and that we won't still be a bunch of marauding ********** fighting over a small planet. I still think that we need some alien threat to sort that out though. :3
Let's face it, in the Star Trek universe, it took a third world war, and a modified nuclear missile in order to get the attention of aliens, and unite mankind. And even then, it was still a little...tenacious.