Regarding this specific product, you get exactly what you pay for. First off, whey concentrate is listed as the primary ingredient, followed by isolate. In the supplement industry, that usually means the concentrate makes up the bulk of the formula, while the isolate might just be present in trace amounts since they don't disclose exact percentages on the label. Furthermore, there’s zero mention of the processing method used here. That’s a massive red flag. If high heat was used during production, you're looking at a much higher percentage of denatured proteins.
Keep one thing in mind: raw material costs are climbing steadily. It is physically impossible to source high-quality ingredients and sell them at rock-bottom prices. You get what you pay for, plain and simple. This stuff will suffice for a casual hobbyist, but if you actually have the budget to choose, I wouldn't recommend it.
http://www.bodybuilding.com/shop/supplements/protein-powder/muscle-milk-3G-2268g.aspx