Is polyamory wrong even when everyone involved is happy and consent is given?

No it's not. If you're doing something where everyone is feeling good and you're not harming anyone else, it's not wrong at all. Whatever makes you happy.

From whom perspective are you worried it would be wrong? If everyone involved is responsible on their actions and the consequences of what they are doing, if everyone is happy and allows each and every individual a chance and the possibility of feeling like they belong, who can say anything else? Thinking in right/wrong depending on what someone else who isn't involved thinks, you may not ever live the way you want. So do what makes you happy regardles of what someone else thinks.

It depends on by what standard we choose to judge "right" and "wrong". Some have standards which dictate the morality of such things based on religious traditions or other cultural orientations. From a purely pragmatic standpoint, if everyone has consented to an alternative type of relationship (even if they are not necessarily "happy"), then whether it is "right" or "wrong" in the eyes of a third party is irrelevant.

No polyamory is not wrong at all as long as all the parties involved are aware and respected. Love is love.

You don't actually know if everyone is truly happy and confident with consent. It's hard to manage a relationship between only two people. It is even harder to imagine a relationship with strong bonds between more than two partners just because everyone has his own principles and opinion.

If everyone is happy and the consent is given then it should be fine. Make sure that the party that is married to many also can effort to handle and take care of all partners and kids as well.

It depends upon (say) Mr./Ms.X and all the partners he/she is involved with. We speak about open relationships and open marriages nowadays. If all the parties to the relationship are aware of the fact that multiple partners are involved and they all agree to it and are okay with it - then who is anybody to judge Mr./Ms. X? The acceptance of polygamy by the partners is important however, they should be made aware of it before getting involved. And then, you are good to go - as long as you are not hurting someone else's emotions and feelings.

I think that is a personal question that has to be decided by all those involved. That said, there are many things to consider when entering into a polyamorous relationship. Trust and open communication among all involved are very important. Also, remember that happiness and consent can fluctuate throughout a relationship and can change depending on how comfortable each partner feels about the arrangement as time progresses.

Polyamory is not wrong for People are Free to do everything they want if they don't restrict anothers happiness or well-being.

Up for debate. Some people think it's wrong, others think it's the only right way. But who cares about whether people think it's wrong? If all people are happy and gave consent, there is no reason why anyone should listen to other people's morals. If the people in a polyamory relationship feel that it's right, then it's right, regardless of what people think.