and if I just watched these OTHER ones (on which nobody agrees)

I had the same reaction you did to the first episode, and haven't delved much further yet. (I did watch one or two more, and they were vastly more watchable, but I've had other priorities.)

But as to this: virtually everyone I've talked to, and every critic I've read, seems to agree that "San Junipero" is worth watching, even if one watches none of the rest of the series. It's the one episode that seems to be pretty universally acclaimed...