What are you talking about? In the absence of data, any assertion is equally valid. It could be microbes, it could be flying alien insectoids, it could be a mind hive of sentient Borgs.
All equally possible because our only reference point is earth and life here.
Are we kooks for accepting that we exist?
We won't really answer the question how it looks like anytime in the foreseeable future unless we find it within our own solar system.