I should add, I am under the assumption that the enemies were made to 5e rules as well (standard number of attacks, AC, HP, etc. No crazy surfaces or bag of items, etc.). Given that it was likely a proof of concept sort of build (DoS 2 engine but direct 5e stats and rules) I know it will be a lot rougher than what we have now. But why not just test it with the public? See if you had the assumptions correct that it would be viewed as unfun.
I'm willing to bet the reason they thought it wouldn't be fun and that the low level characters kept missing is because while the characters were adhered closer to 5e rules as written, the enemies were the same way they are now from the start AKA OP as hell with buffed stats and a ludicrous number of attacks per turn.
