I should be too, I suppose, as I use and adore Sparrow for Mac (not so much for iPhone). But schadenfreude warms my heart too much for this to douse it.
Open source software gets a lot of knocks for poor usability and integration. But you know what happens when the developers of an open source project stop working on it? Someone else can pick up the code and keep going right where they left off.
I love my Mac, but on a long enough timescale Richard Stallman is always right.
Update: Matt Gemmell says it way better.