The A8-6600k will be able to handle most light-weight games, and some medium games, at or near fullspeed. Budokai and Brawl will probably be near fullspeed, SMBW will probably have some slowdowns, and don't know about Hulk.
Dolphin relies on strong single-core speeds in the CPU, and the AMD APUs are behind Intel in that respect. When people ask us about hardware, we recommend Intel Haswell CPUs because they're currently the fastest. If you want to get some faster speeds, look into getting a Pentium G3220 or i3-4340/i3-4130 (Haswell) with a Z87 motherboard so that you can get an i5-4670k later on, or upgrade to Broadwell when they're released. The integrated graphics aren't as good as APU integrated, but you can use it for a while while saving up for a nice AMD/Nvidia card that will be better than AMD/Intel integrated.
Dolphin relies on strong single-core speeds in the CPU, and the AMD APUs are behind Intel in that respect. When people ask us about hardware, we recommend Intel Haswell CPUs because they're currently the fastest. If you want to get some faster speeds, look into getting a Pentium G3220 or i3-4340/i3-4130 (Haswell) with a Z87 motherboard so that you can get an i5-4670k later on, or upgrade to Broadwell when they're released. The integrated graphics aren't as good as APU integrated, but you can use it for a while while saving up for a nice AMD/Nvidia card that will be better than AMD/Intel integrated.