To add a different perspective to this, I think there are a number of things that make it worth growing.
I personally am not huge on the taste, but it is certainly a novelty. I'm not a huge sugar person though, and it makes things taste so sweet that it alters their fundamental flavor altogether. Like, dumping a full cup of white sugar on top of it sweet. That was my experience of it anyway, which might vary per person.
I have heard that others do not respond to it. So this is individual, but I think the vast majority of people do...
If you want to try it ahead of time, you can purchase tabs online in places like Amazon.com that are very expensive, but should give you the general experience. If you are one of those who don't respond to the tabs of a well-reviewed brand, you might not respond to the fruit either.
On the plus side:
It's a small plant that can easily grow a lot of fruit. That alone can make it worth growing for many who have limited space for warm-climate plants.
If you are a sugar addict and/or diabetic, it certainly can be a "miracle" for you.
You can grow it for the medicinal properties alone.
It's worth a good amount of money. Consider that even if you're not into it, it will be popular with many people, and will be something people will continuously want to purchase - you can sell plants online/by craigslist, to your local nursery, and sell fruit at a local farmer's market if you have enough, or again online. Miracle fruit plants also make welcome gifts for most people.
It's fun to try purely for the novelty of growing, and is a reasonably attractive plant.
CAUTIONS:
The temptation to eat miracle berry with highly acidic foods purely to try out the novelty over and over, can harm both your stomach and teeth. Just because it tastes sweet, does not mean it is. Some people take this overboard without considering consequences, and will guzzle a bottle of vinegar or chew on lemons every day, and that can damage the tissues in your mouth, your tooth enamel, as well as your stomach lining/esophagus. It's kind of like if your skin lost the ability to detect the difference between hot and cold - doesn't mean you should hold your hand over a fire, simply because it doesn't hurt initially. Common sense is still needed.
I find it worth growing, but then again, I have enough space, and a favorable climate, and there's very little I don't find worth growing. If you're not a sugar addict and only had the space for 1 plant, I wouldn't think Miracle Berry should be the choice. But, if you have a little extra room or extra cash, definitely I think it's worth having in a collection, if only because if you grow it successfully it can make back the money you paid for it in the long run, and then some.