Your favorite console from each of the big 3 and why?

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Nintendo - NES.  The most amazing console ever made.  It had so many new types of games that made huge breakthroughs:  Super Mario Bros 1-3, Zelda 1-2, all the Mega Man games, Final Fantasy, Dragon Quest, Metal Gear, Tetris, Dr Mario, Ninja Gaiden, Punch Out, etc...  It also had the first light gun with lots of cool light gun games.  It revived console gaming from the dead!  No other console even comes close to the NES's greatness.  (Maybe the Switch will.  We'll have to wait and see.

Sony - PS2.  I came for the Final Fantasy, but then I found plenty of other great games after that: Spider-Man 2, Katamari Damacy, Guitar Hero 3, Kiingdom Hearts, Shadow of the Colossus, etc....  I'm on a huge PS2 kick right now, too.  I'm going back and trying out several new games I missed the first time around.  There is a lot more treasure here for me to discover.

Microsoft- none.  Never owned a Microsoft console.

Atari - Atari 2600.  My first console.  I was just blown away by the fact that you could control something on your TV screen.  It had lots of fun arcade ports plus some great Activision games.  H.E.R.O, Adventure, Space Invaders, Missle Command, Kangaroo, Mr. Do's Castle, etc... are all great games that I remember playing.

Sega - Genesis.  This was a really fun console that I explored a bit deeper last year.  I may come back to it.  It has a real good mix of both arcade ports and console originals.  Sonic the Hedgehog 1-3, Golden Axe, Shining Force, Monster Boy, etc...  Just a really solid system.