None of Apple's software is best in class - regardless of the segment. Which isn't necessarily bad, so long as it's at least good enough. Increasingly it's not even good enough. Siri? I agree. It's not a joke - it's a toy. I've pretty much stopped using it because it's more an exercise of frustration than utility.
We could continue on with the iWork/iLife software suites which you quickly learn are typically best for casual use. What's sad is Apple has truly excellent hardware, it's too bad they don't have the software to match. That tells me their viewing themselves as a hardware company is deeply ingrained in their corporate culture and in their corporate DNA. Software is apparently a secondary concern.