I Know that the OS is still i beta but I'm having two issues. -Wi-Fi Drops all the time and doesn't auto connect after standby. -Safari quits unexpectedly and shows an error sheet which it sends to Apple. These are the only issues i have with Yosemite, apart from that i really like the new OS. Please let me know below what issues you are experiencing and whether you like Yosemite or not.
I usually use a new system after it get more complete. I was tired to solve so many incompatibility problems.
Works perfect on: Optiplex 780, 16Gb RAM, Q9400, GT 210 and Lenovo Thinkcenter M73, 16Gb RAM, i3-4130, Intel HD 4400
Yes, Yosemite screwed wifi cards all around the world. My MacBook-Air (2014) shows the same symptons you are describing. Even after 3 or 4 updates wifi still does not work on Yosemite. Regarding Safari, it could be a problem with any add-on you may have installed. Anyways, a system reinstall will certainly get rid of the problem as this is not a general problem associated with Yosemite, it seems to be something happening on your device, so, because of that, it may have a solution (which is not the case of wifi).
About your problems with wi-fi; what do you not try drivers for it from hackintosh sites? I had some problems with my mac and that was my solution.