There is no right for wrong for gambling. If you treat it as entertainment and do not addict to it, it is like a hobby and enjoyable.
Ultimately, what differentiates a hobby from an addiction is that hobbies are voluntary. Of course, if you're passionate about your hobby, you may feel compelled to do it, and could even go through withdrawal when you have to take a break from your hobby. Hobbies, though, are fulfilling in their own right, not something you do to get a high or because you feel like you must do them to feel normal.