Clara made an interesting companion to Matt Smith before he left. I think that the age difference between Coleman and Capaldi was something that could not be overcome due to the scripts. This is not in any way an attack upon Coleman, but rather upon the writers and producers of Doctor Who.
Of course, I see things from an American perspective and I understand that Doctor Who has not been as highly received in the UK as it has in the US with Capaldi in the starring role. Even the "death" of Clara seemed unnecessarily long and drawn-out. I did not time the scene, but I was reminded of the Matt Smith regeneration scene because it took forever to get through. I did not see the need for this.
I know some people cried during last night's scene. If I had been tempted to, it would have only been to celebrate the fact that Clara was finally gone!