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My own personal take on this is that I find it hard to support the theory that if you get a warm planet with water on it, and a Sun at the right distance, that life will naturally follow.
We haven't found anything as far as I know to support the idea that life forming on earth is not a colossal one off event. There are theories all over the place, but unless we find life on one of the squishier solar system moons, or on the other planets, and then prove that life on earth didn't just come from that planet anyway (or vice-versa) then we can't really know.
Resorting to infinities doesn't float my boat, as that just means that everything is happening somewhere, which doesn't tell us anything really.
The whole DNA/RNA combination seems so tricky to get going, that the odds are quite possibly, literally beyond astronomical of it happening again.
Until we can trace our own life history back to the source, or create life in the lab, I'm assuming that life is pretty damn rare, but I hope I'm wrong.
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