Ah, so much misinformation - "Macinsoft?" Really? So uninformed and obviously ignorant to using the product.
Personally I don't like AMD - I got burnt 15 years ago with a mainboard and video I bought and never touched their products again.
That's not to say they're "bad", but it's my personal preference. One of my techies loves his Radeon cards.
There is absolutely nothing wrong with Windows 8. It's a polished, very optimized product. They had a few issues with 8.1, but it is a very stable product and I have been using it for months.
There are currently more copies of Windows 8 sold than there are Macintosh O/S based PC's world-wide - over 100 million copies sold - and that excludes Corporate Volume Licensing. The product is a huge success.
Hell, there were even some forums that were touting Windows 8 running Battlefield 4 better than Windows 7 during the beta.
Your "lagged" fps is probably more to do with the WoW client and network lag more so than the PC you have.