It doesn't look great but it's not an issue as far as longevity is concerned. Not uncommon either to have uncoated suspension components. It all really depends on the level of work you want to do to change it. You could just paint on POR-15 for the least amount of work. Wire wheel to take off rust and then paint with a suspension (high chip resistance) paint. Or realize eventually the bushings and ball joint will wear and you'll be replacing the lower control arms anyway. Personally, I did the last option with my 2006.