I generally hate flare. To remove flare (which content aware cannot fix) you can create a new layer and set the blend mode to color. Use the color picker to pic a color right next to the flare and then paint over the flare. You may need to brighter or darken the spot when finished. Needless to say, I almost always remove flare. Flare is caused by the lens not the camera. Some lenses are better at avoiding flare than others. Nevertheless, do your best to shield the lens from the sun so that the front element of the lens is in the shade (I just use my hand or my hat). Shielding your lens in this way also increases the contrast of your image. With really wide angle lenses this is very difficult because I don't want my hand or my hat in the image. When shooting into the sun we just do not have a choice, sometimes we will get flare.

          As much as I hate flare, flare has it's place in some images and may actually add to the image. I find, for me, such images are desert and dry images. The flare empahizes the heat and the harshness of the landscape. The flare almost makes you see the sun burn down. For these scenes I want to create flare deliberately. To do so I use a wide angle lens and place the sun to one side so that it angles across the scene. Here is an example:

I like the color spots the flare makes with the other beams of light. It adds drama and the other elements already mentioned. Compositionally, I used the tree's shadow as a lead-in line that goes right to the sun. The other trees and clouds offer interest to look at in the rest of the image. To create the feeling of harsh, dry, hot, and almost lifelessness I placed my camera at a low angle to exaggerate the dry and cracked up desert crust. I wanted to feature the crust as it helps tell the story.

          Read your scene and think about what look and mood you want to achieve. You may just need to remove flare when it does not suit the scene but you may want to include it when it adds to the scene. You decide ...