John:
I think you can have odd hole sequences, relative to par, and still have solid routing, and by the same token have fairly traditional hole sequences relative to par and have lousy routing.
Lawsonia rather famously has a stretch of holes (9 through 14) that goes 5-3-5-3-5-3, but none of it feels contrived, in part because Langford routed the holes over land that feels right for the par on those holes, and (even better) varied the shot requirements on them, so you don't always feel that you're hitting the same clubs over and over. Two of the par 3s play essentially as connector holes, to get from one part of the course to another, but they both have some solid qualities that don't make them seem routine, like some connector holes do.
URidge, on the other hand, starts out 4-5-3-4-3-5 -- pretty standard stuff for the distribution of the holes. But the routing is pretty contrived, in my view, and the demands are such that the course never really starts to flow until your round is a third over -- the mark of poor routing.
Like the good Justice Potter Stewart's views on pornography, routing may very well be one of those highly individualistic things, more "felt" by the player as good or bad than anything specifically related to par distribution. Courses that have really good routing -- to my mind, Lawsonia is obviously one, but I'd also put Milwaukee CC up there -- just feel like the next hole is the obvious one that should follow.