I just had to weigh in, being the unwelcome newbie here. But I've read a few of these articles, and I've been a part of other fandoms where this sort of issue has arisen. The way I look at it: They are coworkers. How many of you absolutely 100% adore your coworkers? I mean sure, they are probably decent people. But are you "besties" away from work?
From what I've seen, they work fine together, and I've also read that they aren't opposed to doing more episodes of "Sherlock." Whether that will ever happen is one of the greatest mysteries of the world.
I have read that Martin Freeman is less than friendly in most situations, but with that, I can heavily identify. LOL