Wow, some one must not be happy with their program. For starters, the real deal - in reference to the original post:
1. You have two full academic years to learn, not 45 days. If you're talking about learning something during a slightly shortened quarter, well, that's the same scenario as in undergrad. Via your logic, undergrad should also be a complete waste.
2. If you can't learn from your classmates, either you're the most amazing person ever, you're an arrogant prick who refuses to listen to your classmates, delusional, or just out right suck at talking to people...
3, I'm not going to comment on the technical degree...it's clearly not science or engineering, so in that sense, I agree with you. Although since you mentioned Chicago...if you take their analytical finance emphasis, well, that gets pretty darn technical.
4. You can absolutely learn an awful lot in the program...at least if you choose to. You can learn anything from complex finance, to describing wine (wine clubs), everything from you peers (which you apparently have already neglected), team work (if you decide to participate, but seeing that you apparently hate your classmates, this is probably not going to work for you either), to skills and experience through experiential learning programs...if you can't learn anything by working in a PE firm for an entire term, well, please refer to the general comments provided in #2.
5. Well, I do have to agree with the party aspect of the MBA...nice one, you finally made a valid point. Business school is a great time, you meet lots of entertaining people who like to experience life...darn.
6. A fluff degree? Well, I'm not going to say that it can't be a fluff degree...you can make it what you want. If you decide to turn it into complete fluff, you're wasting your opportunity and cash.
7. A commodity? I'm not so sure about that. For starters, Chicago's class is less than 600, not 1500. If you count the part timers, etc, you may get to 1500, but the full time students have signficant advantages for recruiting and elsewhere. Basically, if an MBA was completely commoditized, you would have practically zero differentiation amongst programs. While this may be true if you migrate down the quality ladder, the grads from the top ranked programs are highly differentiated in terms of salary, experience, where they want to go and what they want to do...that's not a commodity...just look at the salary distributions of the people in the top 5 programs...that's a big range. If you go to a pretty crappy program, the degree may begin to look more like a commodity. Interestingly enough, the general consensus is that the value of the degree essentially becomes zero at a certain point (say programs ranked under 50). This behavior is suggestive of poor programs essentially being a commodity, as in a commodity market, profit margins are essentially driven to zero because of competitive forces (i.e. your ROI will go to zero).