It's kind of hard for me to separate good actors from good writing these days.
Star Wars = good actors, bad writing
I can't think of an example that goes the other way....which sort of proves your point I guess...
Take game of thrones for example. Where the heck did they get all these unknown brits to just come in and blow that series out of the water? I'm telling you it's the writing. Although british stage actors are kind of famous for being great character actors. What did peter dinklage ever do before thrones? How is he so good on that show? They write to his strengths.
I agree that acting and writing are hard to tease apart. Direction has something to do with it, too. For an example of good writing and not-so-good acting, I'd nominate Ben Affleck in Good Will Hunting. And to throw another curveball into the conversation, I tend to separate "actors" from "movie-stars" in my mind, each of which I think have their places, and some few people can manage both (Jennifer Lawrence, off the top of my head, I think is both).
An actor I'm keeping an eye on is Michael B. Jordan. He's only 30, and seems to be trying to balance action movies and dramas. His upcoming movies are Fahrenheit 451 (opposite Michael Shannon, who I also like), Creed 2, and Black Panther, all of which are on my films radar.
Josh Malina.Who doesn't love Bradley Whitford?
It's kind of hard for me to separate good actors from good writing these days. I watch a lot more tv shows than movies now. Are the guys on Silicon Valley great acting talents or does that show just have really great writers?
Anyway, I think Mathew Rhys and Kerri Russell from the Americans are outstanding. And I love Noah Emmerich, he's the FBI agent in the show and he's been in a bunch of other stuff. He's like a character actor mostly. Kerri Russell has been in a lot of stuff but I think she really hit her stride with this series and took it to a whole new level. But the deep emotional and conflicted writing lets her do that. Matthew Rhys I haven't seen in anything else so I can't say.
I also love Ron Perlman just cus he's a badass in everything he's in.
Tom Hardy is good but he always seems to play like the same guy. Only one movie I saw did he change it up a bit, The Drop where he plays an awkward bar tender with ties to the mob. In the revenant for example he's awesome, a grizzled hunter, the accent is great, but he's like a dark tough guy. Compare that to his fx show taboo where he plays a dark englishman who sailed and lived in africa. Again he's like a tough guy. Even though the characters are drastically different with extremely different accents and looks the feel the same like just badass tough guy types. Which is fine, he's still a fine actor.
I also love liam neeson though he does a lot of one note stuff too. And the late tony soprano James Gandolfini is very underrated for his career. He was also in The Drop, as well as a handful of other movies like Killing Them Softly. He has a much wider range than people think but he got stuck as the iconic tony soprano so everyone thought of him as a mobster only.
British actors are just plain cool like everyone in game of thrones. I'm really excited to see what happens to Sophie Turner post thrones. She's also in xmen as a young jean grey. But to see her development as a character on thrones she has definitely changed more than anyone else and been asked to act a lot more and I think she's done well. It's funny cus it's gone right in line with her real life aging. When thrones started she was actually like 15, so just as she's matured in the show she's matured in real life and gotten much deeper and darker. You can see bran and arya characters in the same light, but I don't think their emotional range is as interesting. Arya is a cool character but way less subtle, she's like a big action hero. Bran is just kind of boring as the seer type.