There are a lot contradictions about gambling, In my opinion there are not only bad things about gambling but a lot fun things. Gambling without good thinking and planning will be bad. If you decide to all in, sell your home and all assets just to gamble than i'm sorry for you. Gamble is like a drugs for me, it's okay if we use a little bit to relieve stress or anything that gives you a positive impacts but it will be bad if you use for addictions.
Good or bad is based on the dosage to use it.