Nintendo
Pros - Awesome games that I can show my family and non-gaming friends. Not concerned with massive budgets or bleeding-edge graphics. Pure gaming at its best.
Cons - Too many dormant old IPs and not enough shiny new IPs. Poor relations with many third-party developers. Friend codes.
Microsoft
Pros - Excellent third-party support. Xbox Live Arcade is really great. Controller is nice.
Cons - Everything else about Xbox Live. Unreliable hardware.
Sony
Pros - Some really neat, fun, and artistic IPs (Little Big Planet, ModNation Racers, Ratchet & Clank, Ico/Shadow of the Colossus). Good hardware.
Cons - I don't like many of their currently-active first-party IPs (Uncharted, Killzone, God of War, and Resistance). I'm losing all hope for The Last Guardian.
3DS Friend Code: 0645 - 5827 - 5788
WayForward Kickstarter is best kickstarter: http://www.kickstarter.com/projects/1236620800/shantae-half-genie-hero
