Has its highlights, but certainly not the best thing since sliced bread.
MT takes big points for its appealing premise of taking a complete loser who failed at life, giving him a second chance, and making a man out of him. In a sense, it is a redemption type story with an uncommon approach, harnessing the modern belief of YOLO and positive motivation instead of say, moral guilt. It is also a rare light novel propelled by detailed character focus, strong growth, and... functional, believable relationships.
My only problem here is that these were never of the light novel franchise to begin with. If I wanted detailed characterization I'd go read a traditional novel. LNs are usually categorized for their fast story that keeps the audience constantly entertained -- this pacing is where MT often bogs down.
Furthermore, it's also plagued by some really big minuses.
*Like the fact the main character is so perverted that even as a baby he disgusts people. It's hard to read the MC's thoughts without feeling more than a shade disturbed, unless one is also a hormone-addled teen in the midst of puberty.
*The MC succeeds at learning even complicated tasks with relative easy. Sure, he is described as a diligent person. But it's hard for the reader to that way when he say, successfully casts his first spell within a minute of trying in story.
*The world is super-generic, with a magic system so simple even the most amateur game designer would laugh at. The medieval society they depict isn't any better, and I question if the author ever read anything historic outside of video games. Suffice to say, the writer is no worldbuilder, which becomes a problem when so much time is spent traveling the nooks and crannies of the fantasy world. Every time something is explained about the world, I feel like I just ate a sleeping pill.
My conclusion is:
Yes, MT is much better than maybe 75% of light novels out there. But light novels are hardly the apex of literary finesse. Meanwhile, what good LNs often has to offer -- creativity, alacrity, sympathetic main leads -- is sadly lacking in MT.