Advantage
-they have a good games like zelda,mario,pokemon and other
-they have a memorable and cute characters
-their console is not expensive
Disadvantage
-they don't make a powerful console
-i don't like that they always making a mario or another nintendo characters games(make a different games nintendo im tired of seeing mario's mustache)
Let me add a few things/remix it my way:
Pros:
+Great, really awesome 1st party games
+Not really expensive (both software are hardware. Nintendo games are cheaper (most of the time) than Sony/MS's games)
+Even by removing 1st party games, the libraries are relatively diversified.
+They don't make games in kit, aka $-€50/£45 games for which you need to pay even more because the game was obviously "rushed", so some content that could have been on the disk/cartridge is released in DLC.
+Backward compatibility (And this is a huge plus by today's standards)
Cons:
-Outdated servers/Huge Lag on some 1st Party Games (SSB4 and MK8 seemed to have that problem, while they're not as resource-heavy as some MS/Sony games when it comes to online gameplay)
-The horrendous, the root of all evil, Nintendo's biggest disease: Region-Lock. Still having this in 2015 is inexcusable by today's standards
-Lying to customers when it comes to updates (Of course, I don't want them to put "We blocked XXX game cards because Y", but damn, how stable can Ninty's firmwares get ? *STABILITY INTENSIFIES*)
-The idea of obsoleting millions of players with a 1.5 handheld because money-money-money,
! Instead of this, put some decent hardware and stop this atrocity.
-Mario's getting overused. I know he's Ninty's mascot, but, I'd like to see some of their old mascots being back instead of the usual Mario thing (I mean, it's not as if they had licences like Metroid/F-Zero and more waiting to get "resurrected")
Those are the best things/worst things I can think about when it comes to Ninty. If they can fix those, they are bound to become the best video game company.