In my opinion, one of most overrated animes I've watched (alongside HxH).
Story: Whole thing about dying and reviving was insane concept, something really unique! But the problem is, they haven't got anything out of it. Story is simply nothing special, anime doesn't have any specific direction until the near end, and even then, it doesn't change the overall picture of the story. Imagine if Death Note had bad story like Netflix adaptation for example. Thats how badly they've handled the entire idea with reviving thing. Also reminds me a lot of Life is Strange game, but a lot worse.
Art: Idk if I can say anything special bad/good about it, nothing special, yet nothing terrible.
Sound: One thing that I like about anime is soundtrack. In my opinion, its more than 50% of entire score. And Re:Zero lacks in this part. I can't tell that soundtrack is bad, but it isn't good either. It doesn't have a single memorable track.
Character: As Re:Zero is overrated anime for me, then Subaru Natsuki is overrated MC for me. His character development is kinda dumb, unstable and it doesn't feel real. When you can't explain some characters personality, then it can't be any special. Same goes for other characters, except few in the near end. I loved Subaru's tracksuit tho lol.
Enjoyment: It switches from boredom to excitement all the time. Beginning was really good, intense, until you get used to his deaths, but after that, even episodes which end with "cliffhangers" where something bad will happen, you can kinda realise that he will fix it by dying again and going all over.
Overall: 6, great concept, bad realisation, was interesting at the moments, average characters, and I hope that second season will be any better.