It's an interesting concept. Pastas with your choice of toppings. And for the less creative or lazy soul, they've concocted some creations for you. The prices are not too steep....$8-$10 should get you a large portion with decent mix-ins and they give you a 20% discount for Meatless Mondays. Quite progressive for Las Vegas if I should say so. There is also "Baby Bowls" catered towards children but really, there's more than enough pasta in one for a full-grown human.
The pasta dishes I've had really haven't blown me away. I can make better pasta at home. With fresher ingredients. BUT....sometimes out of sheer lethargy and a massive carb craving, Mac Shack will do the trick. If I didn't work close to this restaurant I probably wouldn't bother with it.
Summary: Palatable pastas, not-so-fresh ingredients, bordering on stinginess on quantities of toppings and decent service.
It's doable but do I really want to "settle" so often?