I think a clarification is in order. The general consensus is that if a tomato is an heirloom it is not a hybrid, and vice versa.
I have had excellent luck with growing plants from collected seeds for any of the heirloom tomatoes I've grown. With hybrids, your mileage may vary.
That being said, I find heirloom tomatoes to be a lot more finicky to grow. Various species are sensitive to diseases. Excessive rain increases chances of diseases, and therefore, a green house or at least rain cover helps out.
That being said, I encourage anyone to try growing their own tomatoes. You will get fruit! It's hugely satisfying. Once you eat a good tomato, it feels like you are in on a secret most people don't know about.