Compare with the current system, where any given user is still effectively dealing with a single payer -- their insurance provider. Their insurance provider is one level of removal from the health system that has to be paid.
Now, the idea of transparency? That's lovely, and would force accountability and that sort of thing which could potentially have impact. I can't disagree with that. I'm not sure that just putting the government in the middle fixes that either, though.
As /u/frgtpsswrdlame points out, we have the most expensive health care, which seems like the bigger issue that isn't addressed. If we lessened the cost of health care in the US, that would probably be a better start, imo. Does single payer fix that? I would think that private, competing companies would seek out better deals vs a single government entity who couldn't really negotiate, but perhaps I've got that backwards.
I'm not disagreeing with the thought on the whole, I just don't see how single payer fixes these problems.