I would also say that many problems that Muslims have today with polygyny stem from a misunderstanding of marriage and what marriage should be. We have opted to believe that the hollywood version of romance and passionate love is what a marriage should produce. The reality is far from this.
The attitude of westerners towards marriage seems to have a trend of personal fulfillment, such that when you get married terms like "other half" or "being completed" are used. I guess when it comes down to it, this means that the individual feels a lack in themselves, and the popular myth is that when you find the right person your "soulmate", that void will be filled. It is rather disturbing actually, and probably has emerged from the entrenched ideology of consumerism that has seeped into every facet of western life to some degree.
We as Muslims are told that created things can not benefit us, only Allah benefits, granted at times through creation. But this has to always be kept in mind, as to easily we can slip into non-Islamic understandings of marriage without even meaning to.
Also, marriage is an act of worshiping, and should make you a better slave of Allah. It should not become a distraction between you and Allah. This can happen and often does as we approach marriage with the wrong intentions. We are warned in the Qur'an to not let our spouses distract us from the remembrance of Allah. We at times concentrate so much on the marital relationship and forget the real relationship that we need to focus on. The goal of marriage is to increase the strength our relationship with Allah, so it is not an end in itself, but rather a means to an end, which is for the spouses to become close to Allah.