For me, I'd have to say the best thing about joining BNet has been the people I've met - not only my boyfriend, but a bunch of people who've become good friends, some of whom I've even been lucky enough to meet IRL.
For you, what's been the best part of joining BNet?
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"Meeting" people through private groups and developing a number of friendships with people with whom I otherwise would never have had any kind of contact. Almost all of those have faded since I haven't really played games or been on this site actively in two years or more, but I still look back on it fondly. Also, I met a pretty good friend through this site. He posted a random link in the Halo 3 forum back in late 2008 advertising a LAN about 30 minutes from my parents' house that I happened to see when it was on the front page (and before he got blacklisted for advertising). Went to his LAN, played with a bunch of good guys, and ended up teaming with him for GB and local LANs until Reach arrived.