Trader Joe's Macaroni and Cheese is part of a line of diner-style dishes called "Joe's Diner." The way it's packaged, it works best as a side dish for two or more, rather than an entree for one person. It's not bad, but it's not stellar. Sonia seems to be a bigger fan of it than I am.
In general, the most common issue I have with TJ's brand foods is that they can be bland. Very few foods have nasty textures or bad tastes, but a minority of their products simply lack flavor. This mac n' cheese is not the worst offender, but I would place it in that camp of slightly bland foods. However, salt, pepper, and/or hot sauce can make this dish quite yummy.
I would say taste-wise, this mac n' cheese ranks just below Kraft Easy Mac. At $2.99 per package, it's probably a little more expensive than Easy Mac. But of course, the TJ's brand is much better for you. I've tried some experiments mixing the Joe's Diner Mac n' Cheese with the TJ's chili. It's a great combo. All in all, I give it Three out of Five Stars...Sonia gives it Five out of Five Stars.
Bottom line: 8 out of 10