While the federal government's poorly performing health care website has been described in Capitol Hill hearings this week as a disaster and a train wreck, California's online enrollment process has behaved, in comparison, like an overachiever. It hasn't operated without glitches. Since its debut Oct. 1, Covered California, the state's online marketplace developed independently of the federal government's site, experienced slowness in the early days, endured trouble with its online directory of doctors and hospitals, and had to be taken offline several times.