I have asked 2 big names this question (giving either name would easily identify me). A wife has an inborn need to have her husband find her 'attractive'. A woman has an inborn need to please her husband, if she dicovers that you like ice in your drink....she will always try and offer it (untill you get annoyed-of course). I don't know for shure if these 2 needs are related, but both play an important role in this issue. She needs to feel that you find her attractive, you can't fake it. And she will try everything (or many things) to do that. So if you choose a wife, to whom you do not find "pleasing...not drop dead gorgeous, but pleasing " then you are doing her a great disfavor. you cannot fulfill your wife's needs.
Additionally, she will drive herself nuts to try every style, color, etc... to acheive this. Who knows, mybe G-D will make a nes and show her a style you are attracted to. But short of that, she will keep looking untill she gives-up.
on the other hand, there is a place for your own need to be attracted to your wife. But seek hadracha on that issue...i haven't had the luxury of meeting a girl to whom an attraction did not develop. The same rav told me to give it till 4 dates (but double check if you are doing shiduchim the israeli way).
ps: mention it to the shadchan, and try having her dress casually, or using a different hair style.