I find man pages a chore to read, and that has definitely held back my skills, so if this actually works—i.e., you can type in any command and get a readable layout of what it does—I can definitely see using it.
Edit: It might be tricky to make this robust enough across all valid commands. I tried a few variations and they didn't seem to work as well. Beware the cherry-picked example.
Also, everyone asking for pipe support is dead on. It's how most commands actually get used, so it's really needed. Plus it would take this tool to a whole new level of coolness.
Edit 2: Who made this? I think if you wanted, you could turn it into a new kind of learning environment for the shell. It already is that, in embryo, but there are a thousand directions it could go. The trouble with learning the command line is the overwhelming mass of information with no way of navigating it or distinguishing what's important from arcane detail. What's badly needed is a simple organizing principle that feels good to work with and lets you learn what you care about right now (and hides the rest). You've got that here.
An it-just-works interactive tool is a really promising way to go. There are countless tutorial articles and books, but they're one-size-fits-all, and once they get too complicated they suffer from the same problems that man pages do. A tool that can actually be used to play with and learn interactively would be a real contribution. But it might be a lot of work to turn this into that. I doubt that the corpus of "all standard Unix commands plus all their options" can be sucked up and re-presented by any generic script; the variations are too unpredictable. There would probably have to be a lot of attention put into important special cases, and a lot of careful design to get it to it-just-worksness. And that is a must-have for beginners.