I stand corrected about Nintendogs outselling New Super Mario Brothers, but if you really think about it, is Nintendogs a 'game'?
I mean, don't get me wrong, I have Japanese Brain Age and I absolutely love it, I play that thing every morning on my way to work. But I don't really consider it a game, as much as a tool for practicing Japanese.
Likewise, Nintendogs doesn't really feel like a 'game' to me. I know many girls who bought the game and a DS because it's cute and they have expendable income. I wonder how many of them bought other games for the system. For them, a DS is a Nintendogs player.
For many people who bought Brain Age, the DS is just a Brain Age simulator.
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Back on topic:
I think the Wii has the potential to give the player new experiences that they haven't had in a game before. It will take some immensely creative and talented developers with a solid vision to do that. I sincerely hope they can, and while doing so, stay away from gimmicks.
The PS3/360 has a different potential. The raw processing power could be harnessed in many different ways, for example, to create living, breathing, dynamic worlds. This power can potentially help developers create new and entirely different gameplay experiences for the player. A well done multimedia presentation DOES matter when creating an experience for the player.
My main problem with Wii is the precision of the controller. It's great for party games, or games that don't highly emphasize skill. But if the controller isn't precise enough, I'm afraid those are the only types of games we'll ever see on the system. Take a fighting game like Virtua Fighter or Tekken. The precision required to play those games at a high level is amazing. Obviously, fighting game players are a smaller, hardcore market, but that doesn't mean they aren't important.
Can the Wii controller deliver that kind of precise control? Think back to the tennis game argument. If I try to swing the controller in a precise, skillful way, and it achieves the same results as limply flicking my wrist, there's no learning curve, there's no way to get better, and I'll subsequently get very bored after playing twice. Good games are easy to pick up, but subsequently get difficult and force the player to get better. SSMB is a good example of a Nintendo game that is very simple to play... but good people will wipe the floor with you.
If the Wii is going to be any more than a 'casual' system, devs. will need to make games that have enough gameplay depth to appeal to 'core gamers', ie. the people who post on this site. Nintendo can continue to succeed financially with party games... but artistically I want games to be elevated beyond just toys.