I just moved here a month ago (from Vienna, which is about 10 miles west), and I like it. I like it especially later at night, around 10 or 11, when the night traffic has died down a bit and it’s busy but not too busy. I like walking down to Courthouse Plaza and sitting by the fountain there because there are less people there than at Market Common.
I like the fact that I can actually walk places, and I like that I can go to Whole Foods, get my groceries, and then walk back to the apartment and cook the things I just bought. Nothing like freshly bought, freshly made food.
I do agree with alykat that it’s a bit more busy than I remember it being growing up, and perhaps at times too busy. This is true of the whole DC area, I think, but especially Arlington because of its proximity to the city. I still like it here, but it’s getting too crowded and I’m starting to want to live somewhere else. With luck, that may happen within the next year or two…