I enjoyed some of Ellen's shows and thought she was quite funny sometimes (though not as a standup comedian). I honestly liked her. I stopped watching when the show got a bit too gamey, pranks, no substance. Just felt like there wasn't anything left for them to do. I also started noticing Ellen's eyes becoming so tired, empty, like she was holding in something/hiding depression/apathy/drug habit or something. I just felt they lost their spark completely (Ellen's eyes sparkled before, to me) and she was struggling to be there because perhaps she doesn't want to give it up or something.
Something about her demeanour changed, even her appearance. Although I think she's an introvert or ambivert, her usual bubbly, enthusiastic manner of interview dimmed and I felt the laughter became a bit forced, like it took too much effort or energy from her. I chalked it up to her being done with the show.
I was always put off by all the gushing celebs on her show and the 'look at me I'm doing good things for people' attitude. The last straw was her birthday last year or 2 years ago (omg! Ellen needed everyone to come and talk about how they were invited, who was there, how awesome it was...it was just too much. "Oh look, my "hot wife Portia" has come to tell you that she bought a charity something something in Africa or so for Elephants or so in my name because she knows I'm such a bleeding heart, caring soul and want nothing else in the world").
I don't follow her or celebs in general and this is news to me, although not entirely surprising.