It's a weird mix of a positive, optimistic MC with a justice fetish and a love of the battle and saving others in a world where slavery, rape, torture, murder, war, etc. happen in a fricken game(?). Worth reading? What is worth reading? I dunno what you find worth reading. It's not bad in my opinion but that's just my opinion. It's up to the reader to decide if it's 'worth it'. Oh, and he's an orc of course. Not like the loveable cliches actually surround him. It's closer to other orcs in Korean novels rather than the Orcs in the Western style (WoW) or the orcs in Japan (the cliche rapists), or the orcs in old fantasy (Tolkien). Think Orcs from LMS but with a Justice streak.
Bul'tar! Praise the Orc is about justice, having morals and actually following them. It's kinda like a manly men (gentleman?) with battles, friendship, loyalty... If you enjoy those themes, it's pretty good and the story is like 250 chapters long, so it's not long.