I don't think there's a shade of MAC blush I would dislike. The blushes are pigmented enough to show up on most skintones (I'm blessed enough to have medium skin that can wear anything from a baby pink to a dark raisin) but not so pigmented that they're hard to apply (I'm looking at you, BareMinerals loose powder blush. Seriously my bathroom floor will never recover from your mess)
MAC blush was my first blush ever and no other has compared. The formulation is perfect. I just wish I had the money to repurchase regularly.
I have the powder blush in so many shades and I'm in love with all of them, they go on nicely and are easy to blend. I always use a professional blush brush to apply to myself and my clients' faces and that also makes a difference. I just picked any color that I have but the same goes with all my colors, they are all great, sometimes you must use a matte one and sometimes you can play with the shimmered colors.