One Ubisoft employee watched The Prestige years ago and said "You know what Assassin's Creed needs? That Nikola Tesla cameo, but in EVERY SINGLE GAME!"
Considering how badly misrepresented the historical figures are in this franchise, I just don't know who these cameos are for. Historical buffs are going to be upset, and the rest of people won't know enough about them to care. They're pretty much glorified quest givers winking and nudging you constantly and giving you the digest version of their achievements.
At some point it was fun in a "Hey, it's that guy" way, but they have been playing the same card since the second game with VERY little variation to the formula. It's just "go to Darwin's house, hear him give you some bullet points on evolution, kill some dudes for him and the move on to Marx. Repeat."
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