Yeah, it was. Unless we make like crimson scourges and get special dispensation to use it, it's updated 3.0 content.
I agree that it's kind of cool since it only wastes 10 levels of your build instead of 20. Like most of the oa classes, it doesn't really do anything, but it does have a lot of cool little abilities.
opportunist is just as the rogue ability, unless I'm missing something?