IMO the worst issues of D:OS2:

*The armor system. It's just terrible, favouring all-physical over any other party composition.
*The armor system comes with the bonus "if >1 0% CC, if 0 100% CC" system that's just absolutely dreadfully terrible.
*Round robin initiate system
*Any character stats are pointless, gear-stats DOMINATE all (see also; armor system).
*Every single skill is CC+damage (since... ARMOR SYSTEM... AAARGH), rather than being one or the other. Some used to be so in the EA, but where changed since... armor system. Instead of making all either or.

Basically, this armor system added was the worst, and made combat terrible. Anything changed there.
Not that I didn't uninstall D:OS2 already since DE was piled upon Classic and 60GB installation is a bit much for a "maybe I'll give it a try after a few patches".
Sorry Larian. This game really got it's neck wrung by this PvP system added. Another potentially great PvE game ruined for an afterthought that took over all balance decisions smirk