I take your point. I'm a new Mac user. I upgraded from ML to Mavericks and since the upgrade I often experience Finder crashes (spinning colour wheel), iTunes crashes (same deal), Word will often crash (annoying when writing assignments), etc. Under ML the system never crashed applications like this.
This is just my experience, I have an i7 Mac Mini with 16gb of ram which should be more than enough to run this OS without a hitch.
Sounds like it could be bad RAM. You should not be getting all of these crashes.