Watching has had to slow down due to me being busy but I recently watched Mary's eviction, she really was robbed. She was compelling to watch in my opinion and I would have loved to see how the series would have played out if she'd have stayed and Craig had gone. We wouldn't have had Craig's random outbursts of anguish at being ignored by everybody, and Mary would have slowly clashed with every single person in the house. I'd also like to know what Roberto's obsession was with Mary, he seemed to love her even when she was being absolutely vile to him. I think in the episode before her eviction they're arguing but he's helping her make her bed at the same time.
The only time I ever found Saskia remotely interesting was when she confronted Mary in Day 5. I think that Mary was very bitchy to slag Saskia off when Saskia sat with her on launch night when she felt very low and Saskia had some great points. However, I haven't watched the rest of the series in years beyond Day 7 due to my rewatch grinding to a halt so Saskia may have her random moments of being interesting.