80% of doctors don't suck.

It's not that lawyers suck, per se. It's that you're dealing with an adversary, and if you get a 50th percentile lawyer to go against a 90th percentile lawyer, well, you could still win if you've got a good case, but it's certainly not as likely as the reverse. In many cases you get what you pay for.

Not sure about percentages, but it is definitely true that for any professional service, most people are just trying to make some money and go about their they without being bothered or caring too much. So you almost always have to deal with people that don't care about you or your situation and will just give you some template solution that fits their situation and their past experiences (not yours).

In particular it is very evident with doctors when they see you for barely a few minutes and diagnose you. Sure, if it's something super common you'll be fine, but if it's not, good luck trying to convince them to keep digging. They seem to think they are always right and you have no idea what you are talking about because you are not a doctor.

Or most people do poor work 80% of the time and good work 20% of the time. I think most people are capable of doing good work, if they are motivated and free of distractions.