First, my apologies for digging up an old post.
I've lived in the westside, northside, beaches, riverside/avondale, and am now in JCP. Every area has its pros and cons. I particularly miss riverside/avondale. My wife and I enjoyed being able to walk to just about everything, and seeing so many people out and about was a major draw for us. However, with a baby and hopefully more in the future, the thought of schools and neighborhoods drew us out to JCP. Like many have said, it's a great place for families. Part of the reason I think the schools do well here is because of the family-focus of the area. It's likely not the place for single folks or young couples without kids, but once you do have kids, it's a pretty nice place to raise them.
While traffic is heavy, it really is no worse than on any other major artery (e.g. Arlington Expressway near the Matthews), Roosevelt, Southside Blvd, etc.