It's not bad, but most are going to want more flair. This skin has a very "washed out"/faded look to it - not enough contrast.
No doubt that it's clean, and any default skin does need to lean more towards the lightweight look and not the heavyweight look, which this one does. Users can always add to lightweight, but it's hard to remove from heavyweight
It's blue, I'm not a fan of blue skins at the best of times. I never use the default skin on a forum, so wouldn't use it for that reason... but it's fresh and clean and easy on the eyes, so for a default out of the box theme it checks all boxes!