Since I saw a lot of articles (ok, two: GameSpy's S/CS and CubeEurpe's Roundtable) on the topic of whether fan input should be listened to or whether it should be ignored I felt the need to talk about that stuff a bit, if just to get my thoughts written down.
PRO
Fans are the people who will buy the game. That's pretty obvious. They usually have played the game (or its precedessor) to death and know every single weak point of the balancing. Unlike developers they aren't blinded by the development process (creating a piece makes you blind for its faults, only after taking a long break from it you can make somewhat objective decisions about it) and can see the flaws the devs might no longer be able to see.
CONTRA (my position)
Fans are often blinded as well. They love a certain part of a game and want to defend it against any change they don't think of as favourable. They don't play the development builds, they have no idea how the change influences the experience.
I can cite Trackmania as an example: The game (racing/puzzle) has no collision with other cars. While that seems like a major fault at first, the devs explained their decision to remove car collision: It was impossible to drive a perfect race and got really frustrating after 5 minutes. Would an outside person have known this? No. They'd complain loudly.
Not every obvious change would have been a change for the better.
Some (or maybe most) fans don't know that much about the balancing in the reference game and will want features that would seriously imbalance the game just because they seem logical (say, enabling walking on certain material or jumping at certain places).
Also, fans are contradicting and slightly conservative. Some want more powerful weapons, others want weaker weapons. Some want more realism, others don't. Who would you prefer over the other?
Imagine Sunshine had no waterpack. You think it'd be better? Be honest, wouldn't you have shouted at Nintendo for "rehashing" an older game? Sunshine has puzzles around the waterpack. Those wouldn't work with the SM64 gameplay.
In one article they said many people just want additional content for the first game to lengthen the good experience they had. But ask yourself, would that work? Every gameplay has its limits and those might have been reached by the first game. If they tried another game with the same mechanics they might run out of ideas for the levels. You'd shout at them for becoming repetitive. A game cannot be stretched to any length. Maybe they didn't have any ideas for more levels for Pikmin? Would you have liked them to just repeat the same levels over and over again (*cough*Halo*cough*)?
I guess that block could have been reduced to less than half while still saying the same. I'm too tired, though. Night.