rebecca is easy to do 3 man, she can be soloed herself by Sci or Eng; infact the only reason you need 3 is so you can do the consoles.
and please don't remove the forcefield, I don't want this to turn into another part of the game where you can just throw bodies at it untill you win. This problem already plagues all space combat except the start of KA and they've done a 'good job' at keeping it away from most of the ground combat so far.
I do not doubt that it can be done by three people (requirement of the consoles) but just haven't seen the team that has done it yet.
Yes, I have solo'ed Rebecca a few times already. Only once from her alcove, the rest of the time, it has been from a corner she got 'stuck' in (force dome and cover shields) Quickest take downs I have seen (actually been in the fight)
Corner fight that I pinned her with force domes and cover shields. TAC absolutely shredded her from a flank position, as I did rifle butt exposes.
Center fight - I melee'd with bath'leth, everyone else took a side, so there was always multiple flank shots happening. She dropped so fast, we thought we bugged the mission somehow.
I've seen her drop really fast as well, it's weird. Normally it's when shes in the center and everyone is firing for me as well, although other times she will just kill everyone in the center lol
Whenever I've soloed her (since the vents starting appearing near entrance) I used the alcoves on the East wall, saving HD shots for knocking off the 2 borg that spawn there and straight up tanking her on my medic.
I tend to agree with the OP that the forcefielded door is kind of silly and over the top. Otherwise, Infected is ok. I would also caution the OP tha tif they feel Infected is too long, be prepared for much longer STFs as the Cure and especially Khitomer Accord can take several hours to finish.