I think not much would have been needed for Mirror's Edge to become a very influential title.

It still is the way it is but I figure it would be even greater with a little something more.

Modnation Racers

Daikatana.

Red Steel - Good game but had the capability to be best FPS of the first half of the generation.

Actually no. Geist is a game that Nintendo publihed and helped development with N-Space. The console was not a mistake. I played Geist and it's actually a good game, but on any platform it would go under the radar.

The mistake was that the game changed many times during its development and many things were taken out. And yes, the game had a lot of potential

Back on topic:

this is my list of missed pottential

• Red Steel
• Legend of Zelda: Twilight Princess
• Wii Music
• Lufia DS
• Metal Gear Solid: The Twin Snakes
• Mega Man ZX
• Metroid Prime 3: Corruption

Folklore

I loved the concept and the visual style was amazing, but it just wasn't fun. Plus the dialgue/comics/cinematic combo was weird and a bit disorienting. They should've picked one and stuck with it.

You weren't content with being Romero's bitch? You wanted more?

I would say Star Control 3!  Cause Star Control 2 was a super amazing reading a good scifi book, role playing and playing a good blow them up!  One of my most favorite games ever PC 1992:

http://www.youtube.com/watch?v=8F55msxPTgk

And probably Cursed Mountain for the Wii.  I wanted to play that game so bad, but was so paned in review after review. 

Hmmm, a lot of games could fall on this category. Most recently, I would say DA2. 

DAO was such an amazing game, combining the elements from Baldur's Gate and KOTOR, two of the best Bioware series ever made. The battle system was complex but accesible if you gave it enough time, and it had an epic story behind it. 

Sadly, DA2 is just a shell of it's former being. Completely unthoughtful combat system, annihilating any kind of strategy or actually deep thinking, a story that literally pissed on the greatness of DAO, amongst many other things.

KOTOR II could fall into this category as well, but since the Restoration project has been released, I have no more qualms about it anymore. 
The Third Birthday is also a game that could have had great potential, given the amazing background of the PE series, but it was a complete letdown, butchering the story and having no relation whatsoever to the PE games. It was a "sad" comeback after 11 years of waiting.

/thread