@rolstoppable - Agreed. We only allow good games in here. Any mention of Superman 64 being your favorite game and you shall be exiled post-haste.
It's a tricky question. First you have to define "good," and everyone will have their own opinions of that. Some games are good in one way but lacking in others, such as good graphics but poor gameplay, good gameplay but poor graphics or music or any number of things. If someone really loves good graphics, the good gameplay may not be enough to qualify the game as good for them if it has bad graphics.
I'd say that in a general sense, developers don't put enough effort into many aspects of their games, especially where franchises are involved. Tight schedules, publishers making decisions that developers should really be making, etc, are some of the things to blame. If you want better games, it'll probably take a major restructuring of the industry. Good luck.
And if you ask me, the potential of video games has hardly had its surface scratched yet, so by that standard very few games have been good.
"Whenever you find a man who says he doesn't believe in a real Right and Wrong, you will find the same man going back on this a moment later." -C.S. Lewis
"We all make choices... but in the end, our choices... make us." -Andrew Ryan, Bioshock
Prediction: Wii passes 360 in US between July - September 2008. (Wii supply will be the issue to watch, and barring any freak incidents between now and then as well.) - 6/5/08; Wow, came true even earlier. Wii is a monster.