15fps is playable if you're alright with it feeling like a turd. There is definitely a difference between 30fps and 60fps. Sure if ask a regular fool if there is a difference between 30 and 60 he would say there wasn't but then if you actually got him down to play a game running at 30 and then at 60 he would also tell you there is something different but he doesn't not what, it just 'feels' better.I don't think end users in general can really tell the difference between a game running at 30fps or 90fps on a console, and I don't think any of them actually care, as long as its playable




