My take on holes being "out of character":
A golf course can cover different sets of topography, yes. However, when doing this, the designer must take extra care to design the "X" holes to have the same design principles as the "Y" holes. One course of which a friend of mine is a member is Tower Ridge Country Club (Simsbury, CT). It was built on either side of a road. on one side of this road (near the Farmington River) lie holes 2, 3, 12, and 13. The rest, of course, are on the mountain side of the road. All of the greens are fairly small, and are pitched, with varying degrees of severity, from back to front, EXCEPT for the 2nd. It's just an insipid, pre-fab-like 2-tier green with the right third higher than the rest. No pitch otherwise, really. I think that that makes this hole 'out of character.' To me, it feels like it just doesn't fit, and disrupts the flow of the course.
Do I abhor variation from hole-to-hole? No, but there is a difference between acceptable variation and disjointedness. Personally, I can't define it, but I'll know it when I see it.