I have had bear meat from about 6 bears killed in Ca. Not a huge sample size but enough to have an opinion. I have not had any gamey tasting or "bad" bear meat yet. The bears were all taken in the Sierras in the fall during deer season. They ranged from 150 pounds to well over 400 pounds. We are very careful with our bear meat and cool it ASAP. I also will not continue hunting deer once I have a bear on the ground until the bear is back home and in a cooler or freezer. I will also not shoot a bear that I cannot retrieve in a few hours. I pass on a lot of bears in deer season.
I was told for years and years the same thing about big boar hogs taken in the hot time of the year. I have also never had a bad hog and some were well over 200 pounds and killed on 100 degree days. Getting them cooled immediately possibly made all the difference and I have had a lot more wild hog meat than bear meat. There must be a few out there that tasted bad for some reason but I haven't had any yet. Maybe if you shoot a hog or a bear that is eating garbage they taste bad but all of mine have been in the wild and not near a location where garbage was available.