Besides the fact that the script was written that way...
...why exactly did the concept of The Green Hornet work?
First I'll just say that I've always enjoyed the series, and the non-traditional vigilante style of crime fighting, and I was able to catch a few episodes on SyFy a week or two ago for the first time in quite some years, which made me think of this.
Why did The Green Hornet have such a notorious reputation? For most, if not all of what we, as the audience saw, The Green Hornet was pretty much a huge failure as a criminal. We know his real intentions, but for the average citizen in the world of the show, he would just seem like an incompetent fool in a costume running around screwing every plan of his up. Since Britt didn't actually want to harm people or ruin lives/businesses, The Green Hornet usually wasn't very successful. He would team up with some criminal who was planning a heist or kidnapping or whatever, and then would screw up their plan from the inside. The headlines would always be something like "4 suspects arrested during attempted bank robbery, Green Hornet evades Police"
So:
1. Where did his reputation come from if all of these plans the news/police reported he was the mastermind of would all fail?
2. Why would criminals keep letting him in on their plans? Wouldn't they realize that everyone that teams up with The Green Hornet seems to have their plan fall apart, and then get caught when it goes bad, while he manages to get away at the last second?
Did Britt and Kato pull jobs on their own every once in a while besides the stuff we see, possibly focusing on businesses that Britt owned so they wouldn't harm anyone by doing it? Just so they could keep their reputation up? It just doesn't make sense how he would have the reputation he has when everything he does appears to go wrong to the average citizen who isn't in on the real idea of what The Green Hornet does.