I didn't expect it to work this well, and I have to say it far exceeded my expectations. I just DL'd Xenoblade Chronicles in about 20 minutes, and it runs perfect on Dolphin 3.0, 100% speed, sound runs great, and I even have anti-alasting 9x SSAA and Anistropic filtering X16 with no slow downs at all. Graphics look better than on a real Wii. Didn't even need any FPS boosters enabled. To get rid of the sound glitches on Xenoblade, all I did was changed the audio back end from Dsound to Xaudio2 and it runs perfect. Solid 25 FPS which is 100% frames for that game. No slow downs at all. I see no graphics glitches whatsoever.
My CPU is an Intel I5 2500k not even OC'd yet with Radeon 6970 crossfire, but it is only using one of the GPUs for Dolphin. I would say those with a similar processor and a middle of the road GPU could get similar results on this emulator. Phenom II quad core, or Radeon 5XXX series, or Nvidia 4XX series could probably work.
To already have an emulator out that gets perfect emulation on many Wii games when the system is still in its prime is nothing less than amazing. They must have some real talent working on the Dolphin emulator.