Personally the first thing that made me feel good was getting married to that Once honered guy, his name escapes me, and moving him to a big house, just so he won't have to resort to begging, plus his dialog is nice.
Same applies to Scouts, even more if you move him to Windhelm.
The Mara quest line, despite the lack of same six couples *grumbles as he shakes his fist*, the whole mini quest line had me smiling all day, it was nice and a good escape from all the STABSTABSTAB, for me it gave a more human element to the people of Riften.
Seeing Maven herself at Griell's wedding with Benor and congratulating them both showed that she had some emotions in the dept of her little black heart, yea I know it's gameplay mechanics, but the rp aspect of it was nice.
And by the nine, don't turn this into a CW debate.