Disclaimer: It's been months since I read this, but I have read it twice, and it is one of my favorites. I'm also a bit biased, giving it a perfect score from memory.

The premise is essentially that someone near the peak of sorcery awakes his memories in a modern dungeon-delving type world, and goes about using those powers to grow powerful and defend the world.
What I love about it, honestly, is that it does magic right. It has intricacies, and the main battleforce of someone with power is in their base and preparations. In the beginning, it's more about supporting magics, but there's still a lot that can be done.

Personally, I'd categorize this under overpowered MC, but there's definitely growth. It even goes through a Xianxia-esque growth cycle of ascending to semi-godhood, which is one of my favorite endings.
Also personally, my main focus for any magic series should be on creating interesting magics. Magic devices, magic forces, magic towers. Honestly, why go about creating a bunch of fireballs if you can create an army or a business empire? It portrays magic as having proper complexities and intricacies, and not just being "I want fire to ball so fire balls."

The love interest is great, too, in her own unique way. She's sufficiently strong on her own, from what my poor memory recalls. She continues to grow and invest in herself, and I think that's great. At least, it's better than love interests that constantly get threatened, or create emotional drama, like in other stories.

Hmm, I need to talk more, but my memory is bad.. The art is good, and there's a lot of side characters with their own unique stories as well. The main character doesn't just plow over them, but they're allowed to shine in their own ways, even if only briefly. A lot of times they do serve as foils to show the main character's strength, but other times they deal with differences in morality, and have proper confrontations.

I can't recall any scenes where I thought "Wow, the author really just wanted to have this scene, so he made some unrealistic events happen like the main character not using their abilities."

The side characters pull their weight in fights, which is kinda required in series where there's a threat to the entire world.
Honestly, I feel like my review can't do it justice. Maybe eventually I'll read it a third time just to give it a better one. Looking at it, it's only 143 chapters. It's long enough to have good content and growth, but short enough it doesn't repeat or get drawn out endlessly.
I think that's what a series really should do. Get to the point, show some growth, have some nice fights, and move on. It's definitely worth some love.