So far at least on the PS3 the motion support has been abismal - the game developers are motion impeared and appear to have no idea how to make use of it other than the most rudimentary applications or in some cases misused it. Sony have decided to provide absolutly no motion support in the OS which has ensured even if you wanted it to substitute for other coontrols theere is no support - the best use i have seen of the sixaxis is actually some mame games a fellow rigged up over a few spare weekends with glovepie on his PC - One clever person beat all of pS3's development community with his weekend experiments, which included trying a gyroscopic aiming system .
The Sixaxis is more usefull with MAME a PC and Govepie than a PS3 !
My solution to the problem is getting a Wii - Nintendo have won me over with their WiiMotes !
Will keep the PS3 as a blu-dvd player.
PS3 number 1 fan
