The first and second fallout games had nothing to do with Bethesda, they only came in for Fallout 3.
And to shock and horror I was never a fan of Fallout 1 & 2 either. They were hardcore RPGs, and I couldn't even get out of the starting area without dying.
As for Bethesda I did not like Morrowind for reasons I no longer remember.
Fallout 3 was a mixed bag, badly written story, clunky mechanics, but I enjoyed the exploration.
New Vegas was not made by Bethesda, and they are still seething over the fact that people like it more than any of their games. I'm not sure I personally like it more, I liked it for different reasons, but primarily the hardcore mode which required you to sleep, eat, and drink clean water. It elevated the whole experience giving it much more immersion and stakes and made it necessary to plan ahead. The reason I'm not ranking it above Fallout 3 overall is that the exploration was nerfed, the map became restrictive with narrow paths leading to and from locations.
Oblivion was basically the same story as F3 for me, worthless story, no characters to mention, basic mechanics, but loved to roam in it and do side content. Also modded it extensively but mostly only cosmetic mods.
Skyrim, same thing again, worthless story, except I did not even like the frigid northern setting, but still the only aspect worth anything was the exploration. I did not put more than 40 hours into it, which is much less than previous Bethesda RPGs, but IDK the exact numbers for those pre-steam games.
Fallout 4 had a slightly better story, and finally decent mechanics, I put over 100 hours on the clock, which is a lot for me.
Starfield is the same old, with a new setting. People hate on it much more than the other games, which baffles me as I don't believe it is any worse than those. I played it for 150 hours, which by sheer value for money puts it well above Fallout 4. Of course it is flawed, but so were all the other games. It's not like I don't wish it was even better, but I don't regret buying it at all.
The short end of it is that I don't enjoy their games but am, somewhat, enjoying this series.
I really don't enjoy the series, 2 episodes in, but enjoyed all their games at least to a certain degree except morrowind.