How many times is this now? Four? Five?
I really disliked Clara in Series 7B. She was characterless and bland. Couldn't stand her. However, I really liked her in 'Day of the Doctor' for some reason, and then that was solidified in Series 8. I'm able to enjoy her character and her relationship with the Doctor now that she's more developed. I think her having to adapt and change to the Doctor's new personality brought the best out of her, in terms of grounding her as a character. She was a bit whiny and bratty here and there in Series 8, but that's better than Series 7's utter blandness, at least.
But my problem is... She's left the doors of the TARDIS and died too many times for me to actually care whether she stays or goes now. I can't see myself feeling sad to see her go because of how many times Moffat has already played that card and beat that dead horse. Which is a shame because, as I said, I have come to like Clara as a companion.
So I can't say it's 'sad' to see her go anymore, but I will say I am thankful for Jenna's contribution to the show, especially in Series 8.