I guess it depends on where you live. For me, not only is Nav antiquated in terms of basic features but it gets lost about 70-80% of the time. I was told by a Tesla friend, it's the most complained about issue followed by Media Player.
I will say the one thing I've noticed with nav that's the most consistent issue for me (though better now than it has been in the past) is when it has you take an offramp only to have you get right back on that highway either immediately (offramp to onramp at same exit) or after a bit of unnecessary driving to the next onramp for the same highway you were just on. We're wise enough to catch it now when it does happen, but that seems like it'd be a simple-enough thing to fix.