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I'll bite. 2 km/s is a measure of escape velocity, which seems to be a reasonable way to quantify the depth of a gravity well, but I'm not qualified to say whether it's a more or less useful measurement than the gravitational acceleration.
What did you expect, really? Why would Blizzard alienate all the fans of the first game by completely changing it up?
On the flip side, I can say that if you've played SC1 and enjoyed it, you'll probably enjoy SC2 as well. In fact, there are a bunch of little improvements (rally workers to resources, idle worker button, select more than 12 units at once, better pathing, etc.) that make 2 much less of a hassle at times than 1.
I'm a little confused how this guy's "hack" worked as described. I just checked Twitter and it doesn't have password recovery questions. And the "forgot password" form offers to send a password reset link to the email address associated with the account, so it's not going to be a way in unless you have access to the email too.