I liked the episodes, but I always thought it would be more efficient if when drones first injected the nanopeobes, that some sort of sedative would be administered along with it to make the assimilatees more docile and more compliant with the second stage of the process, making it quicker and more efficient. Certainly, the group of people in the assimilation chamber seemed docile and sedated when Seven of Nine came to help them, they seemed to need a bit of urging to go along with her idea. Similarly, in First Contact, the Enterprise E crew members being led away by drones after being injected seemed pretty docile too. So, the screaming seems a bit over the top, as I'd think they'd get the tubule treatment before being taken aboard the cube and being herded to assimilation chambers.
I also don't see why they didn't try to save Seven's father, as he was right there and she could have grabbed on to him when they transported out.