early on i found estelle difficult to get to like. the house was crowded though and air time was limited, and I can't say that what entertainment value I was getting could be pinpointed to any particular housemates.
through the middle game, ray and estelle emerged as strongly principled, highly honourable characters, and that personal qualities are something I appreciate seeing. Even bradley emerged as having more strength and maturity than much of the house, even if ran his mouth a bit. I can't say it was highly entertaining - josh's antics were probably the most entertaining through that period, but I learned an appreciation for those three that I didn't have before
now as the end game draws to a close, I find estelle's continued survival to be a source of constant entertainment. watching the toxic trio scramble, crumble and turn on each other has been delightful, some of the best schadenfreude I've seen on reality tv.
although, i would guess that the point of your question is more revealing about you, OP - that you value entertainment value over other sources of value. I can't really build a case for estelle on that basis, but I can't really build a case for any of them on that basis. I am more interested to see interactions under stress that reveals things about the people themselves than singing, dancing, or fake skits from rank amateurs.