MSN has never liked my site much.

Once and a while it will show me some love, but not often. Right now only 1% of my traffic comes from them. Yahoo traffic makes up about 6%.
I think it does depend on the niche/site because there are others that do quite well with these two engines. But I do think a lot of it is because they are slowly losing much of their traffic to Google. Because even when I rank #1 or #2 for some of my popular keywords in MSN I still don't bring in much more traffic from them... maybe a percentage more if that.