the more you privatise the more expensive things get for a lower quality product.

Err, well, no — a competitive free market will ensure that prices are driven down. What I think you are trying to get at is that healthcare, generally, doesn’t function in a capitalist market, and I would agree. The reason healthcare doesn’t function well under capitalism is because purchases are made under a leonine contract.

Same with roads, utilities, schools etc… the more you privatise the more expensive things get for a lower quality product.

This is the same sort of issue as mentioned above, but for somewhat different reasons — public utilities are intrinsic monopolies, which are inherently anti-competitive.

A well regulated, competitive market is good for many things, but for others it’s atrocious.

It is good under the exact restricitions that you initially described. As soon as you deviate from those restrictions, it breaks down.