the 6100 is marginally better than the 5000. WOW requires a minimum of an Intel 5000, so the 6100 in your mac tops out at just over the minimum meaning you can play, but expect the system to become sluggish when you pump up the video settings. Games that require dedicated GPU's will not be playable on the mac. The 13' Macbook Pro uses a less powerful Intel Iris integrated graphics adapter, which translates to much slower and far less power than current dedicated cards.
