This manga is pretty OK.
The protagonist is overpowered, no surprise there. He lucks out with a good skill, realizes how to abuse it for ludicrous gains, and grinds solo to become fairly strong in a few days.
We've got the childhood friend/love-interest, we've got the victim he saves from player-killers in a dungeon.
I'd say it's perhaps a notch above normal standards, because the execution of these familiar tropes is good.
I'll give it 7/10 for now; to give more than that, I want to see something novel.
For example, I'd like to see more people who cheat the System in different ways, so that it doesn't feel quite as much as if it was designed solely for the MC to find that particular loophole.
To be fair, this manga has just started, and it takes a while to feel out your own unique take on the tropes.