6. Harry Potter & The Order Of The Phoenix
To be fair, I could have used just about any of the games in the Harry Potter series as a great example of getting it right, but I chose the fifth entry for one simple reason. In the first three games, you could travel through many interactive areas of Hogwarts at various points in your journey. In the fifth game, however, the player is awarded a fully-realised Hogwarts castle and school grounds. The attention to detail that has been put into the game's design is paramount. The last couple of games (Half-Blood Prince, and the two Deathly Hallows) had their time to shine, but came out as mere emulations of the game that game before it. This title was developed with exploration built in mind; it rewards you for exploring new areas, and offers many side-missions that can open up the world. The gameplay itself shouldn't go without mention, either; it was the first game in the series to get a release on the Wii, and made use of the Wii's wand-like remote control. Did it have some response time issues? Sure, but it doesn't hurt it too much, and brings a sense of immersion to the game's setting.