idk why you would get into the newer stuff, if you've been spoiled by Ecclestone and Tenant. Those two doctors managed to get that perfect combination between alluding to deep traumatic lore and having fun! and of course, saving everyone (including bits of character development where the doctor is conflicted between his desire to save everyone and not everyone falling under that "everyone" umbrella like the daleks). There was also enough ambiguity around the doctor themself to just make the character really cool and mysterious that you start to lose when you start getting later doctors getting put under the microscope, right down to details of their childhood on Galifrey. The supporting cast between doc 9 and doc 10 was also imo the best of the best. Donna Noble will always be MVP OI SPACE MAN but the likes of the Master and Jack Harkness et al. will always be burned in the memory
I found with the later seasons you do occasionally get some absolutely fucking awesome gems like "Heaven Sent" but then a lot of the newer eps seem aimed for a newer audience, as a lot of the plots are just reused scripts of previous eps. Show was still decent and watchable but that only gets you so far, especially when you recycle plots from previous seasons you're inevitably going to invite comparisons that'll be hard to live up to.
I think every Doctor Who fan has their own opinion on what went wrong, who is to blame (if anyone) and what could be done to fix it. But I think there are some things which aren't exactly controversial here;
-Don't wank off the doctor every episode. It's all right to have an episode every now and then where you can get away with portraying the doctor as the weird alien time traveling entity that is truly dangerous, but not every episode has to be "A good man goes to war." The character is called the doctor for a reason. Focusing on how good they are at being an omnicidal warlord is... More in the spirit of the master than the doctor. There should not be a grand celebration or comedic reference to how many people the doctor has killed too often otherwise it undermines the whole shame of the "you would make a good dalek" episodes they like to remake every now and then.
-On a related degree don't treat the doctor's intelligence as some kind of superpower where he does 5d chess throughout time. He's not a marvel superhero, 9th and 10th doctor made it very clear he's smart but not that smart, and however smart he is, he or she is still bound by the wibbly wobbly laws of physics.
And my one potentially controversial take
-Refocus away from the grand narratives back to episodic fun where each episode could be its own self-contained story. It would make the show much more fun for casual viewers who wouldn't need to understand vast pieces of lore just to get what is going on