It's funny when people talk about life on other planets, and immediately think of little green men with advanced technology. What scientists are looking for is anything as small as single celled organisms which I think is definitely out there somewhere. What about you?
When talking about the possibility of extraterrestrial life coming to Earth they'd have to be incredibly advanced and intelligent (though not necessarily green, or men) to manage it, but otherwise yeah that's definitely the case. While finding intelligent life would be cool, finding very primitive life in its earliest stages would be equally as cool, and perhaps even more useful for its potential applications in understanding abiogenesis. Personally I'm kind of hoping for the latter to be honest.