I'm not one to hang a "Truth is out there" poster on my walls, though I do think there must be other life somewhere out there in the universe, but one thing to think on in regards to possible visitation is this: We literally can't even imagine how faster than light technology would actually work, so if a race had that kind of technology would we even know they were there?
Think of it this way, if we were to say somehow discover time travel tomorrow and then traveled back in time and observe George Washington with a drone we bought off the shelf at say Target, if George Washington saw it up in the sky would he even know what it was or would he just register it as a bird? I'm going to say the latter as he'd have no other frame of reference to compare it to...and that's with only two hundred years of technological advancement. So just imagine a species with an even greater jump on us technologically speaking, would we(like our hypothetical George Washington) just think nothing of them if we even saw them simply because we had no frame of reference for what we were looking at?