Dirt Magazine has published some very informative articles about why pivot placement is important and it's made for interesting reading.
I do agree that there are few munters out there these days, but there are quite profound differences in how a bike feels in certain conditions. Both my suspension bikes are broadly speaking Four Bar bikes, however they ride completely differently.
The Horst link bike feels very plush and never seems to have an issue with traction, however it's prone to pedal induced squat.
The Quad Link bike is stiff under pedalling and always feels controlled, but the rear wheel spits traction suddenly and the suspension bobs when using the granny ring.
