Molly and Sherlock are actually quite similar in a lot of ways.
1. They’re both socially awkward. It may not be in exactly the same way, but neither seem to know how to interact with other people well.
2. They’re both relatively friendless and lonely.
3. They both seem so at home hanging over dead bodies. Neither are squimish, and for all Molly’s emotionalism, she definitely doesn’t seem to sit around crying over every person that comes dead into her morgue (I mean, srlsly, she still asks Holmes out after watching him beat a dead previous co-worker with a riding crop).
4. They’re both smart. Molly is not a dumb woman. She’s a doctor, and apparently a good enough doctor that Holmes won’t work with any other pathologist. Molly and Holmes both seem to be most at home in a lab.
And in the ways that they’re dissimilar, I think is nice. If you think about it, why does Sherlock feel so attached to John? Because John is kind and trustworthy and all those good, even emotional, qualities that Holmes like to pretend are stupid but we know he obviously values. So why would he like all those things about a close friend but not about a woman? That’s one of the things that bothered me about the Irene plot (ONE of the things). Why would he have liked her when she didn’t possess any of the personality traits that he finds endearing about Watson? Watson isn’t a genius, but he still loves him, so I find it hard to believe that would be the only draw of Irene. And to say he likes her just because she so overly sexual is ridiculous. Holmes has seen naked women before, and I’d like to think he’s smarter than the average guy who sees boobs and acts like he can’t live without them. Plus, Irene really wasn’t that empowered if you really think about it. All her power still came from how men reacted to her or what she could get them to do - which is still a way of defining yourself by your relationship to men. Holmes is smart enough to see this, isn’t he? Why would he respect that so much?
Oh well. Anyway, just something I was thinking about.