Ninty fans: they believe they are hated by everyone and are in constant defensive mode.

MS fans: they take any slightly negative comment against MS as a personal attack and attack back with full force.

Sony fans: they believe Sony products deserve more than they do and are in constant overhype mode for even mediocre products.

All three are different forms of insecurity btw.

Nintendo fans: They stubbornly insist on sticking with just one console (Wii) despite the long drought of quality software in recent years and its overall underpoweredness, thus missing out on a HUGE chunk of AAA games released only for the HD twins. And then they blame it on 3rd parties having some sort of conspiracy against them.

Sony fans: Believe that Sony is the greatest and most innovative game company of all time, despite the fact that almost all of Sony's successes since entering the gaming industry have been the result of ripping off their competitors while pushing new multimedia formats like DVD and Blu-Ray. Also love to bring up Sony's current 1st party lineup when knocking M$, while completely ignoring the fact that Sony's successes in the past (much like Microsoft's today) were heavily reliant on 3rd party software.

Microsoft Fans: Think Halo is the greatest thing since sliced bread, and are all too willing to get into a pissing contest with Sony fans about which console has the better graphics.

Bonus... PC Fans: Elite pretentious douchebags. 'Nuff said.

Sony Fans: Blindly arguing that they have the best games

Nintendo Fans: Blindly arguing that they have the best games

Microsoft Fans: Blindly arguing that they have games.

Microsoft: That paying for live is acceptable.
Sony: That their system is far superior.
Nintendo: That nintendo completely embracing the casual market is alright.

OK, I'll add another list.

MS: It's all about profits, even though they're meant to be gamers and care for games, not how MS's business is going thanks to Kinect.

Ninty: They will refuse to even acknowledge that other consoles and games outside of the Nintendo world can be fun.

Sony: They believe that the PS fanbase is the most mature and varied, somehow putting it above other fanbases.

Haven't read anything posted before so forgive me if I repeat something:

Nintendo fans:
- Nintendo was the first to create EVERYTHING.
-HD Games only have good graphics while Wii is all about the gameplay.
-Wii graphics compete with HD Consoles (followed by Hi res pic of Super Mario Galaxy)
-Friend Codes and Nintendo Online are acceptable
-Wii Fit can actually make you lose weight
-Nintendo won E3

Microsoft Fans:
-Kinect has some hidden power waiting to be unleashed
-PS3 has shitty online
-Microsoft won E3
-Xbox Live is worth $60 a year
-Xbox Live Indie games are actually good
-Sony is going out of business

Sony Fans:
-PS3 graphics blow 360 graphics away
-Sony won E3
-People actually care about Playstation Move
-The Vita has a future ;)
-Xbox fans only buy/play shooters while Sony fans are somehow enlightened.

Everybody: People who own other consoles are actually jealous of their console of choice. Look, it's just video games. It's not some exclusive club. If a PS3 owner gave a damn about Halo, they'd buy a 360 just like a 360 owner could buy a PS3 if they gave a damn about Uncharted. People buy what they want because it suits their tastes. You like Zelda? Good for you. You got the console that gave you what you wanted. You shouldn't be judged or condemned because your idea of fun is different.

Nintendo: That late ports of third party titles will be system sellers for Wii U.
Microsoft: That the Microsoft E3 conference was anything other than a disaster.
Sony: That every reviewer has a grudge against Sony when they give a negative score to a PlayStation game.

Nintendo: Graphics and gameplay are mutually exclusive
Microsoft: RARE is equal to or superior to the Rareware of DKC, Blast Corps and Banjo Kazooie.
Sony: FFXIII would've been a better game if it stayed PS3 exclusive

All fans: their first and second party is the best
All fans: picking something their favourite console does well and stating the others are crap because they lack that feature or are behind while ignoring the inferior things of their favourite
All fans: "your company is a copycat"

Wanted to pick one for each but they always end up fitting for all.
Maybe you can guess that I own and use all of the three consoles.