Yes Ogen is possible, tougher then we was but kill able. Yes Alcoves are gone and it is Considerably tougher. DIdn't get her on VA on the our first attempt. It possible to divide out among the pillars, still some weirdness with her de-aggroing. Gonna have to come up with some new strategies. The adds are serious business.
The group I was in yesterday (Most were STF Vets) had trouble with Oggie....until I went to Melee on my Tac....Then opened the proverbial can. Yes...He heals...for a LOT...but if you keep the pressure on him, he goes down...fast.
His healing is for like 1500-2k a shot...If you can keep up the pressure, you can outdamage his healing....So I recommend at least 1, preferably 2 Melee to go to town on him.
However the final room...while possible...we got shafted by a large number of Tac drones, and well...Jump Fail...so we never did manage to finish it....We got to Rebecca once...but half the group had to leave so we never really finished. Second attempt we got in and was completely nucking futs. Borg were mowing thru the group....1 shotting us...and we hadn't even gotten to the first platform to upload the virus....hehehe