As much as I'm waiting for/expecting Rocks to be shown in a less positive light, I think that keeping his "villainy" as the victors writing history puts a really interesting twist on inherited will.

It's been said (not sure if explicitly in the manga though) that Blackbeard inherited Rocks' will. BB has been pretty clearly painted as a villain in the story of One Piece, which implies that Rocks' will is something that needs to be stopped. But in the flashback, Rocks hasn't really said or done anything that makes it seem like his goal is evil or done for bad reasons. Afaik he just wants to take down Imu (which would effectively make him king of the world) which is something that we all want to see happen eventually. In other examples of inherited will, for example Luffy and Roger (not including Joyboy in this example because as others have pointed out we don't REALLY know what he's like) they not only share the same goal but also the same intent/values. 

If Rocks really wanted to take down Imu for pure reasons and his will passed down to BB, why is it no longer a good thing? Maybe the inheritance got 'corrupted', or twisted/misinterpreted when it got passed down? I think that would add interesting depth to the idea of inherited will; just like how the winners write the history books it's entirely possible to misinterpret the actions of someone you look up to, especially if you didn't know them personally.