Doesn't using ACH imply giving a company direct access to your bank account? Credit cards offer all sorts of consumer protections that ACH doesn't have, e.g., the customer can be immediately reimbursed for fraudulent transactions, etc.
Not to mention that credit cards allow people to buy stuff they can't really afford on credit. If you remove that ability, you'll be losing a lot of potential customers.
It's a bit like asking how you feel about being at the mercy of Linux, or web browsers, or SSL. We work with the technology that exists.
That's a little bit facetious, but though there are lots of aspects of the card networks that I dislike (and suspect will change), they work pretty damn well for most transactions. We could devote ourselves to usurping them, but it feels more interesting to see how rapidly we can advance the state of the art instead.