For reference, only 123 managed to sign up for Romneycare in the first month. There are clearly large technical issues, but early on it seems that people also do a lot of "let's see how much it'd cost" and sign up later.
[1]http://www.washingtonpost.com/blogs/wonkblog/wp/2013/10/29/r...
Politifact has a ruling: http://www.politifact.com/truth-o-meter/article/2012/mar/20/...