Miami is right on point.
I had three W's nobody really cared.
Believe it or not admissions committees do not look at every detail of an application. They are human beings and when a few people have to review between 3,000 and 10,000 applications in a few month period they don't review the transcript, personal statement etc in great detail.
For the most part you will either you go in the reject or accept pile based on your numbers, and a 3.7 GPA and 168 LSAT are pretty solid.
If you are really on the fence they might actually read your personal statement and decide to accept or reject you based on that. If after the personal statement your still on the fence they may actually read your letter's of recommendation and make a decision based on that. If your still on the fence they might review your major and the difficult of courses you took to obtain a 3.7 GPA. If your still on the fence after that they might look for W's and an upward or downward trend.
So basically what I am trying to say is more likely than not no admissions officer will even notice the W's.