It's reasonable to think life is very common. It's also reasonable to think that life might be very rare in the universe, or that we could be alone. Science, so far, hasn't really narrowed down orders of magnitude on some of the potential Great Filters. So it doesn't have that much to say about this question, yet.

(And, if you are willing to invoke some form of the anthropic principle, maybe a universe that can support even one instance of intelligent life is itself incredibly rare in some landscape?)