Yes I agree about Tom and was also glad that he went! I'm quite glad in general about all the ones who've left so far, though Nico seemed interesting and I'd have liked to get to know more about him. Tameka was just a bit diva-ish in the cabin.
Lucy puts on an act of being stupid; she did it on Taskmaster too. I don't think she is nearly as clueless as she acts. She repeated something at the round table last night that someone else had said, a wide-eyed 'oh, you mean....' like she had just figured out how that showed the person was maybe lying or whatever, when it was something really pretty obvious (sadly I can't remember exactly what it was now, but it was hardly deception of the century). So I think a lot of her naivety and cluelessness is put on. She's a lot cleverer than she tries to come across, although I'm sure she has her ditzy moments too (maybe more than lots of people!).
I don't mind the tasks either, for the same reason the PP said, showing how the interact, and also some times providing dilemmas, like when they work together to get/use shields, who they help, who is chosen for things, how hard they try for shields themselves, etc