Eddie Murphy is awesome as both Dave (the ship) and its captain, and the supporting cast is brilliant...I smiled throughout the whole movie and had some real laughs, the plot is tight with no real holes I could make out, AND... whoever it was that said the whole premise is silly and laughable is forgetting one important thing about these kind of movies: They're fantasy entertainment.
And on that basis, "Meet Dave" works. Humor, warmth, a friendship/self-confidence message, faith in the good in humans, it's all there and wonderfully done. Of course the plot is more than unlikely, but that's the beauty of movies in general - they can take you to an imaginary world and let you be amazed at the "what-ifs."
It's just such a shame that most people aren't even going to bother seeing this once they glance at the IMDb rating. As for me, I can't wait for the DVD release. It rocks, from the first minute to the last.
Welcome back, Eddie Murphy :)