Didn't she pick Kevin because he really loved her for her, and not "well, we're both fucked so let's be fucked together?" That's how I interpreted that episode, but I haven't rewatched it since it came out. Also, while I see what you and making_excuses might be saying about messed up vs normal and who to date... I dunno. It really depends. I think Robin and Barney, while cute together, could easily just devolve into feeding into each other and reaffirming negative behaviors.

I also agree with what everyone else is saying about her being unable to have kids. Not only is that how a LOT of people act, whether or not they wanted kids, it could easily just be a way to keep her from changing because of something the network or studio or whatever decided "should" happen.