Comming back to what I said earlier, I dont think Capaldi is a bad Doctor really after watching his performance in The Zygon Inversion I think its a case of joining at the wrong time and Moffat not giving us more of that Doctor we love and his Plots are so overcimplicated. and overworked that I think Capaldik would've worked better with a new showrunner, new arc, and early spring airing at like 6-7 in some Big Saturday lineup. Im seeing now Capaldi is trying his best to work against the horrible stories bringing him down but I think he should've joined with a new showrunner. Capaldi in The Zygon Inversion was so funny but serious and mad during that speech and some scenes scattered throughout Series 9 you see thats The Doctor Capaldi is but the problem is it isn't consistant, Capaldi is a great Doctor he can act it but not much he can do when his stories are being written to make him beg us to dislike him, Capaldi reminds me a bit of nine, sure you don't love him at first like with Tennant but there was something else there I could sensemwith Nine that Im beginning to See Capaldi can bring and that is charm and personality nine had that magnificent Northen accent, leather jacket and awesome retorts, and Twelve has a magnificent Scottish accent, Sarcastic sometimes rude humor and you just wanna hug him twelve is broken but you just love him. This is what the scripts struggle to get through rewarching and watching recent episodes its not Capaldi thats the problem its the writers.
Im seeing The Doctor that Im confident Capaldi wants to be but the writers are twisting it Capaldis doctor is supposed To have a nice scottish accent with a bit of banter, hes mad sometimes, crazy, in love with himself and his blue box,, he struggles to socialise normally and has a nice sarcastic and sometimes funny and rude bit of banter with people, he also hates hugs but overtime you'll warm to him. But the scripts aren't getting this through at first I thought it was Capaldi and he should go but rewatching his key moments in some episodes hes a magnificent actor its his stories!
Although he somehow manages to stay posotive even when his bloody Doctor could've been so much more and been written to acommodate those attributes and make him, great.
Aniother thing is they need to undertone a bit of the other characters to make him shine more dont eradicate them completely since their stories are our way into the TARDIS but there discovery and interactions with The Doctor and watching The Doctor deduct is what should be taken into account when writing.