I'm not really one for MP, so I didn't care much. Personally I would love it if more PC games cut MP and slashed the price in half, but I am sure many would disagree with that.
Yeah I'm kinda in that boat myself, which is a big part of the reason other than liking only select types of games that I can't always justify spending a lot on PC upgrades.
I do however respect that lots of people are into mp as I was back in the day, and that without that audience adding to the dev's cash flow we wouldn't see nearly as many games being made.
My main gripe regarding sp vs mp is that more often than not most of the patch work goes into mp whereas sp problems commonly go unfixed despite numerous complaints about them.