You sure?
Definition of infamous : deserving of or causing an evil reputation; shamefully malign; detestable, having an extremely bad reputation.
I am 100% not sure of the text book definition, all I know of is used around me, based on that only. I can see the actual one having a way more negative connotation. Even going by that though, I definitely have seen posts that were too keen on Bitcoinica, but I really feel those were the people who put money in that did not read the manual first to see what they were getting into.
They are certainly no more evil than Mt Gox themselves... that is the textbook definition btw.