Skeleton looks good but not the best. You can also try out Concise Framework if CSS bloating is your problem.

It is good. I have so far been using "Bootstrap" as i feel its a comprehensive framework. An entire app can be built using a single framework rather than adding too many 3rd party plugins and add-ons

Yes, skeleton is extremely simple and light weight. Most of the components are very basic which is good.

I don't like Skeleton's grid system. There are very less options for smaller devices. Also, sites built with Skeleton will have a maximum width of 960px (you need change this manually on the CSS file).

Also, Skeleton doesn't have many customisation support on the Less and Sass version. Hence, if you use Less or Sass very often this might not be useful for you.

I love Skeleton so much I started the Skeleton Framework Organization on Github. We are reviving it and keeping it maintained. We are also offering support through the issue tracker. We want Skeleton to stay alive! Come join us! Skeleton Framework