Absolutely. There is nothing wrong with the interview that you describe. You are learning exactly what you need to learn. Better to learn it today than six weeks into the job.

It is important to be polite, though, so to make it out of the room the usual talking points are:

1. "Our lousy platform was [mandated by management/chosen before I arrived], but I cheerfully got the job done with the inferior tools at hand."

2. "Our mission-critical legacy codebase made change difficult, but at least it was stable and made the company millions of dollars."

3. "I've heard of [interviewer's favorite magical tool] but I was so busy holding the widget factory together that I never had the time to research it and be sure it would solve my problem. Tell me more about [magic]! I've always wanted to work with the sort of brilliant yet sensitive person who uses [magic]."

Then shake hands, smile, leave the room, turn them down the next day, and get a job with a company that values you.

(You may find, however, that talking point #3, a tactic that comes straight from Dale Carnegie, makes your interviewers fall over themselves to hire you. Everyone loves to be invited to explain their favorite things.)