I think weird acting styles can be part of the joy of watching older media. Seems like films mostly switched over to "modern" acting in the 70s (?) and TV had a lot more variety in style (and quality lol) way up into the "modern era".
I'm not gonna say "it's not worse it's just different", coz TBH... It's worse lol. If modern acting was a rare minority style of practice I would seek it out voraciously. But, for the variety I do think it's fun to watch old stuff too!
I was hesitant to make any concrete claims in my comment since I don't know much about it but I _think_ this is basically about The Method i.e. Method Acting.
From what I understand, although people still talk about it as if it's a specialised or niche thing, it's actually basically just how acting is done nowadays (at least for films and in the west).
I'm not gonna say "it's not worse it's just different", coz TBH... It's worse lol. If modern acting was a rare minority style of practice I would seek it out voraciously. But, for the variety I do think it's fun to watch old stuff too!