Its a good simplistic view of everything. I use simplistic because it omits a large number of companies. within the simplistic scope the main flaw is the absence of the horrible nintendo virtual boy from the portables section.
From the greater perspective omissions from the handhelds include the microvision, GP32, GP2x, wonderswan, wonderswan colour, swan crystal, neo geo, neo geo colour, gamate, watara supervision, etc im to lazy to go further as there are lots.
omissions from home consoles are you know what i'm too lazy to finish http://en.wikipedia.org/wiki/List_of_video_game_consoles
I wholeheartedly endorse the simplistic approach beause the whole point of view just gets messy in the end








