Best version of RE4.
Graphics are slightly better than what you saw on the GameCube and already then this was a beautiful game to look at. Nothing mind-blowing here, but you will notice the difference. Also the loading times are shorter so it´s pretty much a seamless experience from start to finish taking 15 to 25 hours to play through.
The main thing in Wii Edition is of course the controls and they work perfectly: I personally don´t want to go back and play with a gamepad after getting used to a wiimote and a nunchuck. Shooting is now easier and this means less frustration in an intense battle. Easier aiming also creates a more satisfying feeling after finishing a bunch of enemies.
Extras include true widescreen display and an HD-TV support. The meat in extras is Separate Ways, which follows the main story in Ada´s perspective. This gives you somewhere around 6-8 hours more gameplay. You can now watch the game´s cutscenes in the Movie Viewer, which is a nice feature. There is also a cool laser weapon included, but in order to get it you need to beat the main game twice: once on Easy or Normal and then on Professional.
The question here is: should you buy this game? If you have never played RE4 before then this is the best version to get and an obvious must-have. If you have already played the original GameCube version and especially the PS2 version then I recommend you to consider one more time. There is nothing new here for PS2 players except the new controls. GameCube players will on the other hand get some new bonus extras, but they will need to play the game through one or even two more times once again in order to get their hands on those extras.
Resident Evil 4 Wii Edition is the best version of a great game.