Muscle Milk has some of the best tasting powders out there, by a large margin. A lot of them taste like eating cake or brownie batter. There are a few foul tasting ones (e.g. banana and cookies and cream IMO), though which you think is foul depends on the person. Also, the RTD drinkable Muscle Milks taste pretty mediocre (and don't have the same ingredients as the powders).
That said, while I used to be a big fan of Cytosport (company that makes Muscle Milk products), I stopped buying form them when it was revealed that their and EAS's products had a very high heavy metal content (lead, mercury, etc.).6-Star
and Optimum Nutrition
are much better brands
on that front. Optimum Nutrition is just great all together (I like their naturals line, which doesn't have any fake sweeteners, not even stevia - so happy someone is finally doing that).
Consumer Reports Chart on Heavy Metals (note, most foods have heavy metals, even wheat bread, the Cytosport/Muscle Milk (and EAS) just have ridiculously high levels):