I think that we Clara fans should not be deceived when others claim that her character was unpopular. If that were the case Clara would have been pushed out of DW after S7. She would not have dominated S8, often receiving more screentime than Capaldi himself. We wouldn't have seen all the drama about whether JC would stay on for S9. Most importantly, ITV would not have chosen Jenna to headline their biggest show.
Hear, hear! Earlier today I saw some very negative comments about Clara and Jenna on a Den of Geek comments thread (I won’t link but it was under their advance review of this weekend’s episode). Jenna is popular and Clara is popular. I’ve seen non-trivial media (ie. non-tabloid) use the term “beloved” in referring to them. Haters gonna hate, but lovers gonna love, too!