At level 20. I had around 23% crit. Though all my gear didn't have the crit stat on it, like i had hoped for. I would say around 30% crit would be nice. But of course, the more the better.
They mentioned that stealth isn't really full invisible. They said that enemies would continue to know your position if you got close but would not attack you. At the moment that could just mean they need to fix how enemies "see" you or if thats just how its gonna be.
DoT damage wasn't really big in DnD. Usually you would use an ability and it would give 5 or 10 damage when the creature took its turn. but it could be shrugged off if they rolled a saving throw. But there wasnt a class that was based off doing consistent dot dmg