Two MAJOR flaws in what you just posted:
First, the DT example and the Maiden example you posted are not equivalent. At all. Maiden took somebody else's music and lyrics (I think it was both, right?) and tried to pass them off as their own. Not cool. DT, in contrast, took a work from a completely different medium and turned it into a song, and did not try to hide what they were doing, any more than they have tried to hide their musical influences. There is a reason that when bands do what Maiden did, you often see legal action, but when bands do what DT did, you don't.
Second, what DT did is not even in the realm of dishonesty. Dishonesty, by definition, entails an intent to deceive. There is no such intent here (unless you know something the rest of us don't). Yeah, the degree to which it bothers you is subjective. Whether or not it is dishonest isn't. There is no dishonesty involved.