I guess I would say, and still say around 60-70 percent. Most of that is mainly on subjective topics in which there is no definitive answer.
I really think they lost a lot of credibility in my eyes when they always blame errors in timing and dates on the zero year. Or when they say, Russel, Rutherford or whoever didn't take the zero year into consideration so their dates were off.
Come on, if it's your job to do all of this research and study the bible, how can you "miss" a year when calculating chronological events? Isn't that like a car mechanic saying that he didn't realize you need to put oil in an engine? He "missed" it?
Rub a Dub