So far as function, the description in the title, "Dutch oven," is pretty accurate.
Compare to traditional Dutch oven.
From user comments, it is apparently large enough to do at least a 14 pound turkey, and it apparently does it well. Negative comments are that it's cheaply made and probably not worth it unless you can get it deeply discounted, which apparently happens. And some chronic difficulties with missing pieces in the box.
A traditional Dutch oven can do everything this think can do and more and can do it more flexibly, being good for open fire pit or oven and for top of the range or grill browning before baking.
In the end, the Rocket is just a roaster adapted for charcoal. And probably due to the flimsiness, it's said to impart a smoke taste, which may or may not be to your taste.