Few manwha adaptations I have seen have been recognised as deserving of credit from all people - Nobelesse, Tower of God, God of Highschool were some of the most prominent webtoons out there and yet the adaptations they received lacked in quality in some degree. I hope this adaptation does not have the same issue; judging on first impression this does not appear to be the case.
Solo levelling's first episode was rather standard industry quality - the plot, the characters were introduced with clarity and coherence - the power system briefly explained, the nature of the MC made clear and the basis of the beginning established. This is essentially checking all the boxes for an opening episode of a show - the necessary.
Animation was very nice - I think the team were faithful to character design but licensing was quality and it wasn't a rip from the original material but maintained the faithfulness. And I think the story was told excellently thus far - however I wish this had been a doubled length episode if I had to nitpick.
Evidently the opening sequence to Solo Levelling is very iconic. The scene this ended on will continue at the start of the next and that's frustrating for me - I know my take may be nitpicking or unpopular but the part that comes next has one of the most iconic moments in Solo Levelling and this episode didn't show that. The pacing in this sense for me was wrong and while I know people hate to see someone criticise but this minor change would've made this a dynamic, unique and quality opening which generated more enthusiasm for the show than ever.
Nevertheless, I cannot complain - the episode didn't actually put a foot wrong besides maybe the pacing, which is subjectively my complaint, not an objective flaw in the show - I was very satisfied with the product the show gave.
In short, a wonderful episode, but it just lacked the quality to go further - 8/10 and I'm sure the next episode is going to be a 9 or 10.