I would wait until you actually read the Sansa/Tyrion marriage in the books because it's actually gross - even if the marriage isn't consummated. (lets just say Sansa ends up naked on a bed anyway) Of course they won't have that be the case in the show because D&D love Tyrion too much to let him be as morally grey as he is in the books, and also Sophie was still only 16 during filming.
Since making that post, I did actually find and read that scene. I agree it is gross—but not to the point that I could call Tyrion a complete, nonredeemable monster/asshole/whatever-name-you-want-here. No more than I could level such a title at Lady Stark, or Jamie, or Dany no matter the utterly shit things that they have done.
Regardless, I think them not doing that in the TV show is one change I could absolutely live with.