Wastefulness of government is fairly uncontroversial, yes. But you're acting like that's all he claims - he's claiming it's both wasteful and that it cannot be fixed. It's a slightly more eloquent version of "make it small enough to drown it in a bathtub".

That government cannot be made to work for the people IS controversial (and kind of un-American, really). That evidence of wastefulness weakens the usefulness of government IS controversial. That a wasteful democractic government at least ostensibly answerable to its constituents isn't better than any alternative IS controversial.

You're basically saying, "he said the sun's coming up tomorrow and we're all going to die in a horrible conflagration, and really the sun coming up tomorrow isn't a particularly controversial opinion".