It would be ironic to rank a team that was 10-2 but playing really well at the end of the season after a 1-2 start at say 10th and another team that was 11-1 but had sketchy wins and one bad loss say 7th, if most folks figured the first team would beat the second team handily.
Ironic may not be the best word. Why do we rank teams? Obviously one reason is to make the top bowl/playoff pairings, but why else? Why doesn't anyone care about the AP poll? Does it not relate to who would beat who in a NF?
I realize match ups can play a role in this calculus. This is why a "Power Poll" can differ from a "regular poll" if the former is based more on who would beat who.
But polls don't really provide guidelines you just vote however you want. At least the committee has a kind of guideline although it's not clear what it means.