Confused about lucid dreams?

I've found many articles on google but they still haven't satisfied me. Some people say that the lucid dreams are the most wonderful things they ever experienced while some others say that it scares the hell out of them and they feel tired in the morning. Who is right? Can I actually eat all I want with the taste and can I actually create a tennis court out of thin air and play tennis with Nadal along with the senses of real life? The concept seems so unreal that its hard to believe.