I think free enterprise is always a good. (Particularly if guided by a just state which would, for example, prohibit trade with enemies, free transfer of critical technologies or import of red cocaine and heroin.)
I think capitalism can go either way. It's primary danger -- beyond those enumerated in the Catechism regarding gross centralization (by merger and takeover), loss of regard for the individual (mass layoffs), etc. -- is in the regard of capital as transcendent.
With interest and other artificial and often wholly arbitrary constructs, material and money becomes more than it is, more than the sum of its parts.
I think that's the point at which it becomes an idol suitable for worship. Nothing in free enterprise to compare with that danger.