Sony.
Not following up on many promises including game releases.
Over pricing the PSP Go and forcing the consumer to pay their prices for games.
Microsoft.
Although they eradicated the problem of faulty hardware with 3 year warranty they were late in implementing it.
Still feel that the hcarge for online is steep despite it being slightly more superior to PSN
Nintendo.
Casual feel to a fair few games.
No Zelda.
Online needs sorting. Its annoying adding people each time you have a new game.