This is one of my old standbys on my cookbook shelf.
All of the steps in the recipes are well-explained, and most of them relatively simple (read: for the adventurous beginner and above). Though not a gourmet cookbook, many recipes taste like it. The Roasted Red Pepper Soup is, "Good enough to serve in the best restaurants."
Best parts: All of the menus give you a schedule (i.e., "2 days ahead, prepare ___") and the amount of time necessary (which, of course varies with the cook), making this a great resource for dinner parties and other special occasions. Most ingredients are easily found and may even be on hand, and the more American-style vegetarian foods are received as exotic by many Europeans, especially non-vegetarians.
Downside: Though I still use this cookbook, I've taken to more adventurous cooking, and an advanced vegetarian chef won't find a lot of new ideas here. Similarly, the more "ethnic" recipes are not totally authentic. However, they are much more suitable for the Western cook unable/unwilling to seek out the special ingredients.
If you're looking for great, relatively simple vegetarian food (that even meat-eaters will enjoy), you'll do well with this. Skip her early ones - the original Moosewood and Enchanted Broccoli Forest; they are too basic to be interesting, even if they set the standard back then.