So.... You are at the Cosmo. Expect it to be expensive and decadent. But then again, you are in Vegas at the City Center! What more could you ask for? AYCE Bone Marrow perhaps? Gelatto? Seafood? Fancy salads? Pappardelle? This place serves it up. I advise arriving right when they open so you can avoid waiting in line for hours.
I like this place because it keeps my portions on check. As stated by Cathy C, they use the pre-plated method. This system enables you to try everything without feeling like your plate is covered with glop's of food. Great for a gobble monster like myself. I adore the salad section. Don't get me wrong, I love my proteins, but found myself going back to the greens. I feel like they use minimal salt so that you can season to taste. The chimichurri sauce at the carving station is pretty flavorful though. Fair warning! Your breath will not smell so heavenly after eating the chimichurri!
I think what you have to keep in mind is that you're not only paying for the upper echelon of buffets. You are also paying for the experience. Your first point of contact is the hostess who rings up your bill and another hostess who takes you to your table- both accommodating, happy and super nice. Every waiter I've had goes above and beyond the norm. Now, if you would rather be left alone to eat in peace and rather not spend the $cA-chiNg$ for a higher end all you can eat.... Well, then this is not the place for you my friend.