The point everyone makes is that both cases are bad examples. Metroid Prime is a prime example of a radical change in direction of the series that meet fan expectations, critical reception and commercial success.
LoS is polarizing as much as DmC, 2D Castlevania in their majority treat LoS as nothing more than a God of War clone. And lest not even bring DmC into the conversation that is a game that polarized things so much that Tameem had to go radio silence for months after the game release, gaming press took arms against DMC fans that voiced their complains about the changes in the game and the game failed to meet capcom expections almost 3 times in a row seeing diminish in market expectations almost every quarter after release for like a year and becoming the worse selling game in the history of the franchise right after the most successful one.
There are better examples of series that changed direction and or original directors that turn out for the best.
I think DmC and Lords of the Shadow stuck out to me because they are the most recent examples.