Earlier quoted context omitted.
Yes 10.10 was released at least a year too early - it really should not be out of beta. I get daily "pizza wheels of death" with 10.10.3 on my Mac Pro. On the same machine I have yet to have Windows 8.1 crash. The hardware is fantastic, the software far less so.
btw did you do a fresh install? I'd always just upgraded and had no problems; until Yosemite. It's a bit more time consuming but Yosemite has worked great for me since I did a fresh install.
I have been using MacOS of various stripes since 1990 (I am a biologist by background and biologists were one of the few groups that stuck with macs through the late 90s). Other than 10.1 Yosemite is the buggiest OS 10 release to date in my experience.