Other systems can pack down as small, as light, etc. But where the JB system really excels is in its compactness, and that it brings it all together in one package.
I had to stick to a tight schedule to make it to the north end of Colvos Passage before the tide turned (http://www.landfall-learning.org/images/misc/mapBlakeIsl.gif). The window was tight. I figured I could spare 15 minutes for lunch. couldn't spend an hour here or an hour there to make it on time. It was rainy and cold. That is the scenario in which a Jetboil comes into its own. I pulled ashore, fired it up and sipped miso soup while my hands warmed up. I was able to heat water right there on the back deck of my boat. It comes out of the dry bag, snaps together, you cook, break it down, and back into the dry bag in a single piece again.
But you are right about it cooking for two (unless you wanted miso soup or something quick to drink for two). I love to cook from scratch and often prefer cooking with other things--an Outback Oven, etc.--too. So it's not like I'm wed to the Jetboil. There are just some situations where it comes into its own, like that--the situation above.
Misc thoughts 1. It is called a “Personal Cooking System”. Very true - unless you like taking turns at boiling water, it is not for two.
2. The stabilizer legs help immensely on uneven ground.
3. I carry an old MSR foil windscreen to use with it. Yes, I know that there is a chance of overheating the cannister, but that can be dealt with. In breezes the screen really helps maintain the flame.
