Games appeal, depends on the player.
Simple statement, but very true, when so much information/technology is available on so many levels.
Looking back over the years of playing I have done, I have seen amazing breakthroughs in gaming. Doom for example broke a mold and remold's of it can still be found today in the most basic forms, like battlefield 2. Monkey Island leaped forward in it's understanding of geekness bringing the genre to multitudes of new players and again in it's most basic form is still seen in games like wow, swg quests etc.
Will's success in Sim's, and his love for games in general, gives him a birds eye view on what players would like to see from his own gaming prespective. Sim's gave us a 2d world with many functions and ablities, yet Spore brings a 3d aspect with more options and different gaming styles. Whilst "some" functions of the sim's games can be repitious, the options available in Spore, should create change within the game your playing, whilst having the stability of known factors you may have come to love or loath, depending on the player you are.
Geekness was laughed at when I was one of those geeks. Many scorned and laughed as I sat and puzzled out text adventures, instead of sitting there racing around a boring track day after day. Nowadays, millions sit down and work out quests on a daily basis, thanks to those with a small insight into whats different. WoW would never be the game it is (boring IMHO) for many people if we did not expand our understanding of what is new and now loved.
Spore is a culmination of many gaming styles, something which many gaming companies would never dream of doing because they forgotten how things got to where they are now.
I, for one, support the Will Wright's of the world and hope they will make changes for the betterment of gaming, rather than dragging themselves along the stagnant known and successful paths, cashing in on known money spinners. Without change we stagenate.... and if the gaming/computer industry did not change so many years ago, where would we be today ? Pac-man expansion 347436 "more obnoxious levels".