Spaghetti squash are all about the texture. Once cooked the flesh pulls apart into thick, slightly crisp, noodle-like strands (see how it's done at How to Cook Spaghetti Squash). Many people then serve it with tomato sauce. I don't find that's the best use of this mild and only slightly sweet squash.
Instead, try Roasted Spaghetti Squash with a bit of butter and salt. Or, use the strands more like rice noodles in this Spicy Spaghetti Squash "Noodles" With Pork. It is also delicious cooked in a gratin or casserole in a creamy sauce or with plenty of cheese, as in this swoon-worthy Spaghetti Squash With Jalapeño Cream.
Spaghetti squash are large, weighing in between 3 and 5 pounds, with pale yellow-white skin.