APU's are perfect for grandma. A simple, only build it once, pc. The upper a8's and a10's will run 'set' media like Blu-ray all day and look great. The problems come in with games. Games are not 'set' media, they have massive amounts of variables and the more complex the game, the harder the gpu has to work. While an apu, paired with 2133 ram, has all the speed necessary for most games, what it lacks is the power that comes with a dedicated gpu. The die itself simply lacks the size to contain all the cuda cores, shaders etc etc, that a dgpu has. Simple games, yes, complex games, no.
Games like WoW are mmorpg, they are primarily cpu bound, vrs BF4 or Assassin's Creed, which are primarily gpu bound, so with faster ram, 2133 is the ideal ram for an APU, an apu will run pretty well. Games like Skyrim are majority single thread, so an apu is gonna such anyways, simply being AMD architecture.
Grandma isn't going to be into WoW, or BF4 or AC but will surf the internet, watch the occasional dvd or Netflix, and Facebook, play with pictures and YouTube recipes, all of which an apu excels at.
If you plan on stronger performance from a dedicated gpu, skip the APU, skip FM2+ and A88 boards and go either Intel i5 or AMD FX. To buy an apu, just to not use 1/2 it's potential is a waste of your money.