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The truth lies somewhere in the middle. It is easy to get enough protein on a vegan diet if you eat multiple servings of high-lysine foods (legumes, seitan, amaranth, quinoa, pistachios, and pumpkin seeds) each day. But there are many vegans who are probably not eating enough high-lysine foods.
Though some vegetable sources of protein contain sufficient values of all essential amino acids, many are lower in one or more essential amino acids than animal sources, especially lysine, and to a lesser extent methionine and threonine. Proteins derived from plant foods (legumes, seeds, grains, and vegetables) can be complete as well (examples include chickpeas, black beans, pumpkin seeds, cashews, cauliflower, quinoa, pistachios, turnip greens, black-eyed peas, and soy).