Low production values???! Okay, some Tom Baker-era stories are lamentably low-production (The Power of Kroll comes to mind; that was ludicrous), but the ones you named are really not "low." Trust me, you need to see something as silly as some of the early Hartnell-era stories to reach the epitome of "low."
But I'm assuming you're not too impressed with the visuals of the planet Logopolis? I wasn't either, but the important thing about that story is that it was Anthony Ainley's first full story playing the Master, introduced Tegan as a Companion, and was Tom Baker's final story. I bawled like a baby throughout the regeneration scene.