Knowing nothing, I just picked it out of Netflix library and gave it a go. Initial reaction was fairly pleasant surprise, the show is about ex-SWAT neck deep in debts trying to wiggle out of the problems via becoming a criminal.
As German and Eastern block shows often go, it has non-heroic way of going about violence, violence just happens, suddenly, unexpectedly, without pathos or epic music and is done incredibly well. As for drama, this is where show lacked quite a lot, most of it is about social brotherhood of two main characters, but it's either hit or miss.
There's also deeper story about internal struggles of local (Russian?) mafia lieutenants, and that's delivered rather poorly. You'll get some sense of understanding of who's-who only by last episode, if at all. Rest of the time, it's a mix of bearded men, black SUV's and fingers full of oversized signet rings.
So, in conclusion, "Idz przodem, bracie" is a violent mix of Ozark/Breaking Bad and The Punisher. It never gets over "it's a tv show"-wall, but is thrilling nevertheless. Definitely as - or more watchable than your typical B-action movie.
If you crave for some good action and a bit exotic setting, give it a go.