Vettel's helmet would be really cool if it just had the 3 color stripes of the German flag made even more predominant, and centered on the helmet. Get rid of all the miscellaneous bullshit all around them, and you'd have a real winner.
The problem with almost all of the current helmets is they are way overly busy...especially when viewed at a distance. They just look like a pile of garbage.
Back in the old days ('70s, '80s, '90s) helmets were graphically much simpler, and all the better for it, too.