This question is like saying are TV signal boosters good? A TV signal booster will make the best part of the signal better and the worse part even worse.
So, the more car drivers there are on the road, the greater the number of good ones and the greater the number of bad ones. It all depends on your journey and who you encounter.
Luckily as a car driver, a motorcyclist and a cyclist, I can't be pigeonholed. I am a human being, first and foremost. I choose to use 3 forms of transport - two of which are fun!. Some out there, on the road, aren't as open minded and only drive boxes for status and couldn't give a rats posterior about other peoples' safety. They look good and drive a more expensive car than you with more gadgets, so they must be a superior being?
You'll also here people say "All cyclists are idiots" and "All motorcycles should be banned". These are comments from ill educated people that shouldn't be on the road and through poor training and road awareness form a biased opinion based on their own immediate surroundings - a car.
The more the numbers increase, the more good ones will be out there and the more bad ones will be out there.
So to answer the poll, I need "an about the same" option.