Overall:
Ah yes, a guy was stabbed and rebirthed into another world. As an isekai junkie, I am set to watch all isekai. This is one of those that explore the trope. Gotta be honest, it is very cliche, but great execution. I put this in a "great" tier. There's a reason for why it is mainstream.
Short conclusion: 9/10
Driving deeper
Art: really good, it is on the higher end of the anime production. the effects are gorgeous in multiple schene, and the fight scenes are awesome and satisfying 9.5/10
Character: Really solid development, some with interesting twists, and some with pretty good backstory. not much to say, except to go experience it yourself. 9/10
Plot: Pretty standard for an isekai, you have the MC who is super OP in some standard. The twist this time is that he is a slime. The interesting point of this is that the plot is usually driven by side character, not the MC. I think this is a pretty good narrative. Oh and the world is really solid, the author did a lot of work. 8.5/10
Conclusion: A prime treat for an isekai enjoyer. A good watch for a normal anime enjoyer. Must watch for a mainstream enjoyer.
9/10 for me.
a mainstream tier, Great watch and is recommended for casual viewers. It's just not a "masterpiece" tier.