I personally enjoy 4th prestige emblem, and when I played Modern Warfare 3. I played up to the point of 4th prestige, level 80. And I do NOT plan on prestiging anymore. I'm aiming for ALL gold guns. =)
4th & 7th IMO. 8,9 and 10th just look plain ugly especially 10th with the random baby face on it. I liked the BO emblems better - more variety in them, these ones are oka but they all just look like random shapes mashed together.