It's as exciting as a pair of old slippers, sometimes almost soporific. It's still about Ryouma starting up businesses in a fantasy world and trying to be a good employer. Occasionally, he goes adventuring, but these scenes wouldn't scare anyone older than about three. The season finale is indistinguishable from all the other episodes (except perhaps duller) and the nearest it gets to danger is Ryouma getting reminded by his shop manager that he hasn't taken a break yet.
In other words, it's more of the same. If you've seen Season 1, you know what to expect. I quite enjoyed it.
The thing about Ryouma is that he's a super-polite 11-year-old who was worked to death by dodgy employers in his former life in Japan. His work-life balance reached the ultimate in unhealthy. Here, he's trying to learn from his mistakes and do better... but he still has to be reminded to take his own advice to his employees. Take breaks, boss. Delegate. Trust the people you've hired and don't worry about leaving town. Japan remains a country that could really use more of this kind of advice.
I find the medieval fantasy world quite interesting. It's almost bizarrely civilised. If you see a dragon, it'll have a rider and a commercial purpose. Monsters exist, but they're little more than pests and they don't significantly interfere with the workings of capitalism. People move from town to town and start up new businesses pretty much as you or I might today. Everything feels so familiar that even the foodstuffs are identical, except perhaps for mildly tweaked words ("semesa" is sesame) and of course the fact that no one knows all the recipes that Ryouma will "invent". On the other hand, though, these towns have slums and it's normal to use child labour, even sending them off to fight monsters. We also know from Season 1 that this world has slavery.
Ryouma evolves new kinds of slime, expands his laundry business and occasionally does some adventuring to keep his hand in. He exchanges letters with Eliaria Jamil, who'll almost certainly be his wife in ten years' time. They never actually meet during this season, but there's a Eliaria focus episode where she goes off to magic school and dislikes her classmates' excessive awareness of social status. (It's a medieval world, remember.) That's ep.9 and it's quite nice.
I wouldn't recommend this show to most people. You've almost got to train yourself to appreciate it. Ryouma never faces a problem he can't overcome easily and quickly. It's twelve episodes of everyone being civilised and nice. I'd have written it off as a waste of time if it weren't for Ryouma's past life and the subtext it provides of a healthy approach to employment. Viewed in that light, the show's clear and consistent in what it's doing. I enjoyed it... but I can't really imagine myself rewatching it.