Only the original series + EoE is worth watching "seriously", rebuilds are sort of a troll commentary on the public reception of the original show, Anno went like "You want more Eva? I'll give you what you want. Are you not entertained?".
They are well worth watching too, but you need to be aware of the context to fully appreciate the message.
The new series is not a “troll”. And clearly watching it you can see as much. It feels like the story Anno always wanted to tell but didn’t have the mental or emotional space to do it in. The story is fully realized and I think it’s actually the most faithful telling of Eva of anything released thus far. I’d even go so far as to say skip the original series and just watch Rebuild. It’s that good.
They are well worth watching too, but you need to be aware of the context to fully appreciate the message.
This guy explains it perfectly: https://www.youtube.com/watch?v=rHIvs0Q-uKI