Post Big Bang-Critical Useless?

Crits are still awesome. It's just not as awesome cause everyone can do it instead of a few key classes getting it. In BB, the dual blader's thorns will raise everyone's minimum crit rate to 30% as well as giving more damage to the crit. I would say that's pretty significant considering that a hero, with no crit raising skill (none passive that is), only has 5% crit. With just thorns, you raised that hero's damage by a whole bunch.

It's really up to you. you won't be "screwed" by going one build over the other. Do whatever you feel is good. Crits are in no way useless. Extra damage is never useless.