There's a few obvious elements that make The Social Network and Moneyball seem similar. They're adaptations of controversial nonfiction books, each with an Aaron Sorkin writing credit and a traditionally comic actor cast in a serious lead role. The chief difference, I think, is that The Social Network wasn't just of interest to software developers - but Moneyball, I think, is almost certainly of interest only to people who care about baseball.
There's
an XKCD about sports narratives that I've always felt was somewhat dismissive and somewhat unjustified. This is fundamentally because I like baseball; I love going to baseball games, and I love baseball narratives. And if you do not love the complex narrative of a baseball season, or even the fundamental narrative of a single baseball game - this movie holds nothing for you. There are scenes which are blatant, unsubtle appeals to emotion - but they worked on me, because they were deployed through the medium of baseball, and like many Americans, baseball holds a deep-seated primal power over me.