What device do you have?
Assuming it's an iPhone you have, I would say if you have a 4S, then absolutely yes you should update. You get ALL the features of iOS 6 with a 4S. I know the Maps has been surrounded by controversy but they have not steered me wrong yet. Plus, since Google just put out its own maps app, that makes it even better.
If you have a 4, then you won't get all the benefits of iOS 6. You'll miss out on turn-by-turn and flyover mode on Maps, but if you download Google maps app, you can get turn by turn. You'll miss out on facetime over cellular too. The phone will still be stable though.
If you have a 3GS, I can't say that it would even matter whether you update or not.
I am running iOS 6.0.1 on my launch day 4S and it runs like a charm!