Honestly what did everyone expect from shadow worlds when they explained it as having to complete mission objectives related to past events if not this?
Were you all expecting him to get thrown into the shadow world and immediately be put on a battlefield? That'd get old real quick after the second or third shadow world.
It's also not like there's not going to be action in the future; just look at the practice shadow worlds they've been in, not to mention there's clearly a foreign army marching presumably towards where they are. Hell, just read the first chapter or so and you can see that the shadow worlds will eventually get brutal.
You shouldn't expect that the beginning of the first shadow world they're put into is going to immediately degenerate into a shoot-em-up. Although they are single rankers, they're still students - and first years at that. How could Hevrion remain their prestige as an academy if half of the first years died on their first mission?
Just put a bit of thought into it guys, I know everybody likes solo levelling but that doesn't mean everything that is slightly similar has to devolve into a knockoff version of it.