I mean, what would consist of "balanced" in your view?I'm not the parent post, and I generally agree with you, but I'll take a stab at it.
I used to have the opinion that NPR was left-leaning. This was primarily due to when I listened to it, which was during my late-morning commute. I believe I was listening to "All Things Considered," which is usually quite a good listen.
However, on certain subjects, I noticed what seemed to be a significant bias in the moderator. Expressions of shock or disbelief at certain things, giving some speakers more time than others, and not calling some speakers on blatantly talking around the question, for example.
Last time I checked, I think I was evaluated as a mildly socialist libertarian. I happen to know a fair amount about guns. As such, I notice terrible inaccuracies and biased language fairly often when reading mainstream media reports on gun-related incidents. The misuse of automatic, semi-automatic, "assault rifle" (which means "scary looking" to journalists), cache versus personal arsenal, etc. It's really a lot like the low quality of technical and science coverage. Basically, similar technical ineptitude leads journalists to appear right wing (e.g. climate change deniers) as what leads them to appear left-leaning (e.g. complete ignorance of gun terminology).
Other parts of NPR have a ridiculously narrow view of the world. "Wait Wait Don't Tell Me" drives me mad with the narrowness of the comedy on there. As it happens, much of their comedy would probably fall under the category of leftist, but I was personally offended by the narrowness and inanity of an apolitical joke (specifically, they were laughing at an experimental airbag for motorcyclists which protects the often-broken hips from impact with the gas tank, but the commentators repeatedly assumed it was solely to protect the groin, so they effectively made "pee-pee" jokes for five minutes).
Anyway, while I don't consider NPR to be a leftist news outlet, per se, I would appreciate if they spent more time educating themselves on certain subjects and tried harder to hold guests accountable for answering questions presented.