Britney's forehead has never bothered me, it looks like a normal eyebrow to hairline ratio to me
I mean if it was like Tyra Banks or, and this is NOT shade, Rihanna..I would understand why fans would make a big deal. But her forehead ratio is nothing out of the ordinary. For most of her career she didn't have bangs, she had either side bangs or a few strands in front of her forehead but that was about it

I do wish she had kept this hairdo, her wig on the cover of Womanizer and Rolling Stone was gorgeous