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Most of the MRP I found are ultra-high on protein and overall aimed toward muscle development. A comparison with Soylent (once its out) could be very interesting though.

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If you're eating at a deficit, high protein is good idea, actually. It helps preserve lean mass, which has important downstream health effects.

I'm not eating about any deficit eating, but normal eating. And high protein is not always a good idea. Everybody doesnt have the same needs. Also there can be long term effect, some of which are still being studied. http://www.mayoclinic.com/health/high-protein-diets/AN00847

There are a wide variety of meal replacement products. Some have high protein, others don't. Some have high calories, some have even higher calories, some don't.

There is plenty of variety in the meal replacement product marketplace.

Here are the brands made by one company (http://abbottnutrition.com/brands/abbott-brands) - they cover just about anything you'd need.

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