5 questions isn't much to go by statistically, besides that 2 of the unanswered ones are from shortly before Christmas and the other from yesterday. Two of them seem fairly obscure as well, so the whole I wouldn't be surprised. Feel free to edit the older ones (ideally improving them) to bump them to the top of the Active list.
Our unanswered question rate is 15% with SO at 19%. I would have expected it to be higher than SO (we do get a lot of obscure questions), but I would agree it does seem a bit high regardless. Our answer rate is not as high as it was during Beta, either.
While I would say the site is "active", it's not perfect. We discussed some of the site's issues before here. If you have any ideas on how to address any of this, please share them.