Yes, absolutely true!
It's certainly a case of diminishing returns for me. Morrowind was amazing 20 years ago. Oblivion wasn't bad. Skyrim was good. Fallout 3, very enjoyable. Fallout 4, been here before.
To be fair, these are my very early first impressions since I've only played for a brief time. I deliberately didn't follow the pre-release stories because I wanted as much of the game and its scope as possible to be a surprise. But the fact it feels like every other Bethesda game in the last, what, 15 years (just checked: I mean 17 years which is how long ago Oblivion was released... bloody hell! Will someone stop the clock?!), really should come as no surprise whatsoever to me.
Anyway, I'm finally going to play a little more now.
ReaperKK, I was loving Dave the Diver a few weeks ago then something else came along and it went on the back burner. Edit: ah, turns out it was Aliens Dark Descent, bought a couple of months after release. And Aliens was superseded by Baldur's Gate 3. The life of a 50 year old gamer with too much time, eh?!