Nintendo: Missed a big chance to fix their online system by tying WiiConnect24 in to WiFi Connection, which could have at least given them a leg up on creating a more hassle-free online experience
Yes, neglecting WiiWare. It's begging for remixed updates of old NES games, like a new Balloon Fight, Ice Climber, or Wrecking Crew
Finally, it really wouldn't hurt to release more information about your upcoming games every once in a while, rather than just leaving us with nothing for six months to a year, then dumping a playable version out at some trade show.

Sony
-Shit was way too expensive.
-They need to work on their development cycles
-Keep former exclusives, exclusives
-Where The Fuck is LOD2?

Konami
-MGS should have died or went on hiatus after MGS4
-Won't let Kojima do something other than MGS
-Where the fuck is Zoe3?

Square-Enix
-No PS3 games till 2009
-Mediocre to crappy JRPGs on 360
-Long ass development cycles
-Little to no PS3 support
-Where The Fuck is FF7 Remake?

 ATLUS
-Where The Fuck Is Persona 5

Dude... PSP rules.

In all honesty i currently perfer my PSP to the HD consoles so far this generation.

I hate handhelds normally too.

Sony:

False advertising, it can't do EVERYTHING!

Microsoft (favoured company) - Poor reliability on the console for most of this generation.

Sony - Cutting rumble meaning I had to buy another controller to get a function that should always have been there. Too many updates instead of 2-3 big updates a year (preference for me, I realise others might want new additions quicker)

Nintendo - Waiting too long for localisation of games after launch. Not enough games targetting me as a gamer.

Nintendo.

Friend codes and still no Super Mario Kart in Australia.