My PS3 collected dust because I really only used it for the exclusives or the Final Fantasy/Metal Gear franchises. When there wasn't an exclusive that interested me, it went ignored aside from its media capabilities.
Wii gathered dust between big exclusives, too.
Both of them were necessary components to my entertainment center and worth having just for the knowledge that I could play any game from anybody at any time but there were definitely droughts.
*edit* Oh, and the DS. I actually own SIX DS consoles but the last two were for my daughter. To be honest, in 2009 I switched to PSP and never looked back. three phats and a white lite are all sitting in a box in my cabinet gathering dust at the moment. My daughter has a pink Lite and a DSi and they still get use, though--and this makes no sense she she has a 3DS and it can play those games! She carries those two, a PSP, a 3DS, an iPod and a Nexus 7 everywhere she goes.
I got a 3DS and went back for the games I ignored, though.
