The best part of the emulator is that, in most cases (or at least if your computer is relatively new), the graphics will be even better than they are on the original consoles. This is because the Wii hardware has a capacity that's quite inferior to modern graphics cards, and this can make all the difference in games with high definition (yes, Wii in HD).
Setting up Dolphin can be a bit difficult, since there are a lot of options available that improve the performance but worsen the graphic quality. You can also configure the Wii controllers however you want, even connecting the Wiimote to your PC (if you have an adapter). Of course, it's best to use an ordinary game controller for almost every game.
Dolphin is the ultimate Wii and Gamecube emulator. And it's constantly updated, so if you have trouble one day, just try again the next. A must-have for Nintendo fans and game lovers everywhere.