I can do infected just fine. I've completed it a couple of times (the limit of my personal ability to endure forced grouped content).
I would have to agree with a couple of points brought up by the original poster. The jump puzzle (you know, platforming in the generator room) generally is un-fun to just about everyone I've talked to. Sure, it is do-able. But is it fun?
Also, the forcefield over the door...while agree with it for during the boss fight itself, it does not need to be present while working on the generators. Perhaps changing its timing to only appear when the boss fight starts would help alleviate some of the issues some people have with the jumping around bit?