Backgrounder: it does seem like this is legit in bg3 EA and if so it is a hilariously abusive build. I hope they don't patch it too quickly.
You also have to consider that Advantage doubles your critical threat chance since you are rolling two dice, so with 5 attacks you have a 50% chance of a crit on one of them.
Also you have BA Hide, disengage and dash so escape is easy.
Yeah, it's pretty hilariously broken. I love it.
What do I win?