Despite the title being the name of the main character, Grog (as a series) is quite an enjoyable group-focused adventure tale full of constant exploration, gory fights and endearing characters, sprinkled with some fish-out-of-water humor here and there. I've read the first three books now in 2021, and I'd say it's my favourite book series of the year.
The book(s) focus on the titular Grog, a Half-Ulkar(Half-Orc) slave raised for both gladiator and bodyguard service. Grog and his fellow gladiatorial slave, Burk, get hired by a group of adventurers on an important quest, and he quickly grows into his role as muscle and bodyguard while both learning from his new companions and maintaining his pride in his status as an elite fighter.
In the third book the group tries to get back from behind enemy lines into a safe winter quarter, but is confronted by enemies old and new at almost every step. The group is forced to flee from enemies too great, but also decide to make a stand when some good (and some loot) is to be gained from it.
What I love about the series are four things, really:
a) The whole story is meaningful, but also a bit down to earth. The group starts with an important quest, but it is not to save the world, just to make their home, the empire, gradually a bit better. Quests later added are informed by the morals of the group, and are again about doing the right thing in the face of adversity. It is not about defeating the Dark Lord (TM) that threatens All Of The World (TM), although their exploits can affect the empire sometimes quite significantly.
b) The characters have distinct personalities, different goals, and different skills, but find a way to work together. The books have a first person protagonist (Grog), but the perspective is used mostly for humor and to contrast his musings to the rest of the group, which allows the other characters to gain a lot of definition from that comparison.
c) All characters of the group are special, but only because they put hard work into becoming that special. Noone is gifted beyond what they put blood and sweat into developing, and in fact one of the recurring themes is that nothing will change about either you or society unless you put a lot of work and discipline into it. I probably would love the books for that message alone.
d) The group rarely stays at one place for a long time (at least within the pages). As a result, there is a somewhat-consistent balance between travel and exploration, group banter, visceral action, scheming, humor and philosophical talk. Which is a nice distribution, in my book.