I have never (left NINTY)as my main gameing platforms. I grew up with NES/SNES. I also have had a Sega Geneis/PS1/Ps2.
Reasons why I love NINTY!
1 Can create some of the simplest game ideas and make them into something great.
2 Never have had any problems with any of there products.
3 Always trying to make games funner.
4 Can get almost anyone to atleast try a game out with me and watch them have fun.
5 Some of my best childhood memories involved a NES/SNES.
7 Puts more focus on the gameplay rather then just shiny graphics. Graphics are nice though if the game is good
8 A big company able to bite there tongue and try to mend broken relationships.(Developers)
10 I love NINTENDO for simply being NINTENDO and not (atleast out right)ever copying a complete idea. (least that I can think of)
Overall I think other companies have had success for the same types of reasons. I would also like to mention that I do enjoy more then just nintendo games/consoles they are just almost always my first pick