I don’t think anyone is making this assumption, and certainly not me.
What I’m saying is that in a show with such a big budget, not a single actor is well known or even decently known. That’s unusual and not a good sign. It’s possible that this show is unique in that it has all great actors and is not paying a ton for them. Certainly it’s possible.
But try to think of another show with even a moderate budget that was awesome with an entire cast of “unknowns.”
There are some movies, Kids comes to mind with a new director, writer, and stars like a then unknown Rosario Dawson and Chloe Sevingny. But that budget was like $400k and I think if they had had $40M they would have had different actors.
They're alright, but just that.
He was a notable child actor who was trying to transition into more adult roles. I'd say he was known, but not the first person you'd ever think of.
Lord of the Rings changed that. It made him an "actor". From there, he got a lot more work and he was able to influence what he worked on.
I mean, seriously, look at Wil Wheaton or that Home Alone kid.
Even Neil Patrick Harris needed a "big break" as an adult to get back into acting.
Perhaps I am just old, and a keen film watcher, but I wouldn't describe him as a lesser known actor at that point in his career.
Also, Sean Bean has long been a well known supporting actor. Anna Karenina, Goldeneye, Patriot Games, etc. But I would concede that he's very much more well known in the UK because of his TV roles, especially Sharpe which ran for 7 series. Again, not a lesser known actor if you're playing the bad guy in a Bond film.