"Marry women of your choice, two, or three, or four; but if you fear that you shall not be able to deal justly (with them), then only one." Al-Qur?an (4:3)
"You will never be able to be fair and just among women (wives)...." Qur?an (4:129)
Hence, Islam does allow having more than one wife, yet it has set conditions for that, which is that the husband should be fair with all his wives, and treat them equally, which is very difficult.
Since it is very difficult to be just with all wives, in practice, most of the Muslim men do not have more than one wife.
Therefore polygyny is not a rule or an order but an exception. Many people are under the misconception that it is compulsory for a Muslim man to have more than one wife.
I fail to see where Allah made polygyny an exception. Wouldn't He have stated one, two, three, or four if that were the case? Instead He started with two, three, or four. And further He stated that "if" (meaning exception) you can't be just then one.
It seems that most muslims believe being just is that you love them equally. That is an impossible thing to do. Furthermore that is not the bases anyway. Allah blesses us to love many people in our lives and they love us, but we never love people the same. It is always different. We have to remember that our perfect example to follow is an nabi SAWS. He SAWS didn't love His wives equally and clearly stated that fact, yet he SAWS gave them all their rights. He SAWS was just to his wives eventhough he SAWS favored one above another. I stressed that againg because first I see we all need to find out how an nabi SAWS lived with his wives, then we need to act on that and that alone. We can't go with our ideas of what love is, justice is, marriage is, or any other _____ is. We have to stick to the Qur'an and Sunnah and follow the ways of the first 3 generations of muslims for success.