I wouldn't call this "reality-tv" series entertaining or entertainment, but it was interesting at times based on which candidate they spent more time learning their background, weaknesses and strongpoints. Some participants like the overweight but spirited, very likeable young woman from Wales was my favorite, while others like the 18yo who complained about everything really spoiled the mood every episode.
I say it was uneven because if you're going to set rules for participants then they should be enforced. I neither like nor dislike Idris Elba, I think I've seen one of his films, but his laconic presence seemed to be stifling at times, too. I felt his trying to be everyone's friend reduced the integrity of the series and just felt strange. Maybe that was an editing issue, however.
I think its a solid 6 because it was a good idea, yet the dicey participant selection was the real problem as the end results clearly showed. The final bouts in the season finale added an additional star, it was definitely exciting. But if it's to come back for another season, they really need better to choose better players, only strategically use Elba and get tougher on participants. It's boxing, after all.