"I don't like it." That's my wife. She doesn't like the Psalm tones in LSB at all. "They're just boring."
Actually, I agree. They ARE boring. But they are also easy. Goes hand in hand, perhaps?
Hang with me here, though. There is something about the simple tone that achieves a noble end. When I am singing the Psalms for Matins or Vespers, it doesn't take long before the Psalm tone itself has completely receded from consciousness. It's the words that take hold and pull you in. And there's always the regret when the Gloria comes along that the Psalm itself is over.
I think that in this instance, boring is good. Excellent even. Because the tones need to be transparent - it's not about beautiful music "moving" you, but the Word of God seizing hold and informing the Church's praying.
Don't get me wrong: I believe we COULD have learned the Gregorian psalm tones. They're not that difficult (and with a teacher like Ben Mayes chanting them all for you at the Lutheran Prayer Brotherhood website, they're that much easier!). But the ones in LSB suit the purpose well enough - they let us sing the Word of God and that's the big thing. So there.