Well one of the reasons that the AF takes care of it’s bases and therefore looks “nicer” as opposed to Army posts is that the AF, for the most part, fights from it’s bases. It’s bases and accompanying infrastructure are vital for mission accomplishment. The Army on the other hand is a more mobile force, their job in war being not to stay in one place. In fact the AF is in Iraq and other places now, helping the Army maintain it’s posts, since they are finished with capturing territory. I would say Navy bases are more like AF bases in this respect. Although I know you guys fight from ships, you can’t stay out there all the time. You need a place to come into port and refit. Naval bases do that nicely.
On Navy bases, you still have many buildings in use that are over 100 years old, and the majority of hangars on Naval Air Bases were built during WW II. Sometimes its historically quaint, and sometimes its just run down. Most Naval ship yards have that eclectic feel of a very old working class neighborhood, that has stuck new houses in whenever they were needed, and patched up the rest.
Although I know the Air Force inherited many bases from the Army, they still are primarily products of the Cold War, and have the look and feel of being planned out with their current use in mind. In contrast, NAS Jacksonville operated a large number of seaplanes and was built with large boat ramps running down to the river. All completely obsolete after the mid 50’s.