Series 8 was pretty solid, really great at times, a couple clunkers aside. Time-Heist is an all-time classic as well as bucking the fan belief of "any story starting with Time is trash", and Flatline is another all-time great, albeit with some Three's Company-style jokes. The Mummy one is overrated, Into the Dalek was a little too much "Fantastic Voyage" but had quite a few great lines, it was a great start to a new Doctor.
Then came series 9, which was pretty awful overall. I remember a scene from the opening story and it's just a dumb 4th joke that has no point to the story. The rest? No recollection or care to revisit.
Thankfully, Series 10 was a sharp step up in the quality department, and more, with Bill and Nardole being an extremely strong team. "The Pilot" was fantastic, blending in fantasy elements in an engaging way, and using the Dalek/Movellan war in a generally decent way, if you can overlook the fact that Movellans are robots that wouldn't scream like that, noting the extermination effect reveals robotic bits and not a skeleton. The scene is more than the sum of its parts, anyhow, leaving the audience wanting more regarding the Movellan conflict, as well as getting the "use a Dalek once per year" quota, and a clever means of using the Dalek against the Heather adversary/mystery. Great stuff and that's just for starters.
The dynamic between 12 and Bill was so refreshing - easily the best of the 21st century revival so far, IMHO.
One little nitpick since, like pimples, everyone's got to have one somewhere, it's about the sunglasses: The magic sunglasses, since I refuse to use the word "sonic" unless it's regarding a hedgehog or 20th century Doctor Who, were an interesting idea given the qualified application, but that also made replica toy manufacturing easier because they weren't a custom design any longer - which in turn inadvertently made the show that much more generic in the process and the Doctor should be anything other than generic.
Only one story completely failed, and Red Dwarf did the same thing to much better effect.
Lastly, Capaldi's final story really shows how the makers never bothered to watch the Hartnell era, what with all of it existing in one form or another in order to get a proper feel of. Overlook that, and the finale is otherwise really good.
Capaldi deserved a longer run, and a complete replacement set of scripts instead of series 9's guff.
Had to look it up:
Capaldi is known to be a robust guitar player, but the scene just doesn't land, unless the goal of a story is to be nothing more than a bunch of 4th wall jokes, which arguably isn't very substantive or rewatchable, not to mention how he got the tank in and out of the TARDIS, or why the 12th century dudes there didn't slice'n'dice him and be done with it... Even more depressing, a guitar is ubiquitous and arguably isn't Doctory enough, unlike the recorder...
or spoons:
Ah yes, the spoons.