Entirely too basic. I rate it 6/10.
We all know the 'fired from the party' genre. A classic analogy for workplace drama/power fantasy, where the idiot boss fires you but really, you were the one keeping the workplace together, so without you, the whole company goes under.
Well, that's exactly what you get here. The MC is a weaponsmith, he gets fired, takes all his weapons with him when he goes, and then his whole guild goes under because of their substandard weapons while the MC is off impressing pretty girls with his shiny weapons.
The author clearly hasn't thought about this much. There are no subversions, variations or complications.
The boss did exactly zero comparison tests between the old and new supplier, used zero hedging of bets, and goes down like a chump.
...The best thing about the manga is that it makes me imagine a better manga where the protagonist is a guildmaster carefully weighing his supplier options and party composition, and trying his best not to hurt people's feelings when he fires them.
To summarize, it's a decent introduction to the genre, but has nothing new to contribute to it.