Writing an evaluation essay on a product is relatively easy because basically, you are constructing a review of a console that most of us are familiar with, and have seen or read reviews of. In fact, you might want to watch a few video reviews to get some ideas of the criteria you can discuss. Your criteria would be things like how easy it is to set up, how intuitive the play is, the game experience, variety of games available, etc. Of course, you will want to compare it to other competing systems, as well as to earlier Nintendo consoles. Your audience would be someone thinking about purchasing the product. So your conclusion would tell them whether or not this is a good purchase and why, or what sort of person would like this particular product.