The art is phenomenal and the comedy is genius. That's about where the good parts of this story end, tbh. The whole ideal of the main character is to be sitting in his cave, doing nothing for centuries at a time while grinding immortality. Realistic, yes, but not at all fun to read about for hundreds of chapters. We, the readers, only get to see 'action' when the author decides to show the system panel that TELLS all of us the crazy shit happening in the world, but doesn't show us.
The only thing you can look forward to if you read this is comedy between disciples, meaningless romance between the mc and the female sect members, the one climactic moment every hundred chapters where the mc shows up and one shots the final enemy of the arc with a new move he got thirty chapters ago just so that everyone and their mother can glaze him for the next arc until he does it again. Rinse, recycle, repeat.