The Proper Care and Feeding of Indefinable ThingsA lot of parings here, but mainly Pepper/Tony, Natasha/Bruce, and Jane/Thor. Background Clint/Natasha (ancient history), Pepper/Tony/Steve (mostly off camera, and how I came to this story, actually), Steve/Darcy.
Yes, I know. Het. Have you somehow gotten waylaid to another Brain of CK? Possily BrainFuck, like you always think this one is, and you mis-typed?
1) I adore Tony and Pepper in the movies, and I like them happy in fanfic, despite the fact that I also adore Steve and Tony together (and hence I sit at the computer with my breakfast, mournfully prodding AO3 trying to make more Steve/Tony/Pepper fall out). Pepper and Tony are awesome together in this. Completely awesome.
2) I love Jane as one of the Science Bros. She belongs there, crabbing around the labs, being as crazily self-destructive as Tony and Bruce, defending her science from them, stealing their stuff to put up her hair, probably much to the amusement of JARVIS.
3) I love Darcy in this. She has her own superpowers, and she is made of awesome.
4) The Natasha/Bruce story is far more compelling that I would have expected for my own tastes in fanfiction. Possibly because it is really interesting being in Natasha's head. And Bruce is sweet.
5) I like Websandwhiskers's detailed touches, like the obvious additional piece of Thor and Jane's wedding, and Frigga at the baby shower.
6) I do adore her (mostly background) Tony - I'm just starting the chapters that may have more Tony.
7) Pepper is awesome in this. You can really never have too much Pepper Potts, IMHO.
In general, I think what this set of stories has going for it is that it is really dominated by the female characters. Pepper, Natasha, Darcy, Jane, even Frigga and Sif. Even little Magpie. Even a female AI, who I'm just meeting, that Tony and Natasha are going to save from bad guys. I have always said that I come to fanfic for the porn - it's better when it's porn with excellent writing and fun plot, but still, I'm not usually looking for the mission!fic for its own sake.
( Decided on a TL;DR cut because now I'm just rambling about my motivations as a reader )