If you look at the Qur'an (anybody done that recently?) you would see that, polygamy is not a right given to every muslim men or an order from god. It is simply PERMITTED in unsual instances.
If you deem it best for the orphans, you may marry their mothers - you may marry two, three, or four. If you fear lest you become unfair, then you shall be content with only one, or with what you already have. Additionally, you are thus more likely to avoid financial hardship. Surah Al-Nesaa', (4:3)
Look at the context or history of this verse. This verse was reveleaved after 'Uhud', where a lot of men died, their wives widoewed and children orphaned. Polygamy was purely allowed in order to protect the orphan kids. ALSO pay close attention to the latter part of that verse. You have to be FAIR to all the wives in all instances.
The same Surah verse 129 states that:You can never be equitable in dealing with more than one wife, no matter how hard you try. Therefore, do not be so biased as to leave one of them hanging (neither enjoying marriage, nor left to marry someone else). If you correct this situation and maintain righteousness, GOD is Forgiver, Most Merciful. Here its crystal clear to me, as Human beings you can never treat all your wives equally.
Therefore the only sane conclusion you can make here is that polygamy is not permitted.
Now you out there. Some please convince me that this is legal in islam? (other than the mentioned instance?) .Especially wahabi's and the adhalath parteys.