I think Minecraft has good graphics, so I definitely have no issues with WoW. Hell, I still think some nes and snes games have good graphics.
Also, I built my computer in 2008 as a high end gaming tower. It was really good for the time, and definitely still stands up today. I can even play Skyrim on medium graphics with no lag except during the civil war questline (just due to how many characters are on screen at once). I don't make as much money as I did back then, so I definitely can't even drop $100 to upgrade my computer right now let alone a grand or two like my tower originally cost me.