Lets start
Lets not spend time deciding whether or not to talk about old games/systems...lets do it
Why classic games are important: embedded in those old games were some hilarious and most fun moments that several (if not 86% of us) enjoyed.
Here are some of my favorite things
Wall jumps on Samus in SNES Metroid:
[Good times]
-the dust off the wall when you do it...and even more fun with high jump boots
-making the little blue heads bob near ballform with it
-using it to get a few of the impossible to get power ups
Metroid II: Gameboy [funny bad times]...just fun rolling for 30 minutes until you see that stupid spike ahead on the ceiling that means you've wasted all that time...but when the spikes hit you sometimes, you may get a chance to jump...but not sure if there was ever enough momentum to get back into spideball before you plummeted 3 screens down into the middle of enemies.
Link to the Past when they temper your sword; when you found the bottles; when you get the cool boomerang
Link's awakening...when you find all those @#$@ shells and get the cool s-word
Batman (NES): walljumps ftw, plus pretty cool music
Best of all (and especially for Double Dragon games), the ~~~nes MAX controller~~~
best controller of all time in my opinion. No point in playing the old games without this, but Wii is fun for other stuff too I'm sure...
Double Dragon (NES) [good times]...hearts give you new moves...the jump kick, the sit-on-them-and-punch (which really takes them out of commission fast)
Double Dragon II (NES) [awesome]...the jump-knee that sends enemies 30 yards away, uppercut that knocks them about 16 feet in the air.
Double Dragon III: [endless fun...till you die at boss lady 5 times] the jump-throw and the wall kick. Plus, getting to play Chin and Ranzou
Mario 3: the bear/stone statue suit and hammer bros suit...but I always died too quickly before I could get too much fun out of 'em... [fun, but doesn't last long]
Brawl Brothers (SNES)...[fun until you go in the wrong sewer doors or building elevators for 2 hrs] the green ninja guy with triple jump and stealth fighting special move.
Faxanadu (NES) [endless fun]...just play it for the music, but also fun to get Tilt magic, or to save up and get the cool shield (and death magic maybe) at the first shop. [Discouraging]: when the boots stop flying and you're not to the fountain guy, or having to listen to the boss music too much.
Wave Race (n64 [not as classic...])...doing a 360 twist at the harbor
Adventure of Link (Zelda II NES): [fun] sword fighting knights; down stabbing; fairy form; high jump. [not fun]: traveling through the swamp and getting hit by powerful enemies all the time.
Gameboy Teteris: (not sure if spelled right, but classic fun worth the price of your first gameboy)
Nuby Gameboy Speakers (again, not sure if spelled right, but perfect for pumping out the jams of Castlevania II: Belmont's Revenge for Gameboy).
Castlevania II (Game boy)...worth playing for the music
Donkey Kong (SNES)...great music and graphics
What does this mean for gaming? It means that the funnest things are not the coolest graphics all the time, the funnest things are not about killing people all the time...its about sport, fun playability, excellent controlability (able to wall jump and at different distances/angles/heights aka Super Metroid), challenging (so that you eventually do things you were not sure were possible), and fun/good/cool music [which can be amazing even if its in that 8-bit Nintendo/Gameboy tones].