Plotwise, Sky Girls became very interesting as time went on. The first five or six episodes were relatively boring, but over time, little plot twists and small details made the series worth watching.
Artwise, it wasn't fantastic, but certainly wasn't bad. Some CG things were really awkward, but they were few and far between. Otherwise, the animation was smooth and the Sonic Divers were made well. Although this isn't related to art, I should mention that while this show does contain mechs, the show doesn't really focus on them. They're moreso just tools used than real plot foci.
Musicwise, there wasn't a whole lot to comment on. The opening is one of the dopiest songs I've ever heard. ("Oh, prerry radies, Sky Girls. Fate understood. Innocent red. Last arms. Haaaaaaaaa.") However, after listening to it far too much, it's kind of catchy. That might just be because I find it kind of deplorable from a musical standpoint, though. The endings were uninteresting and forgettable, in my opinion. The soundtrack is decent but not too notable.
Characterwise, the characters were very well fleshed out and given necessary attention. The interactions between characters were realistic and even very heartwarming at times.
Overallwise (and who needs words anyway?), Sky Girls was surprisingly enjoyable. I give it a seven overall because, while it was a great show, it wasn't that great, and the shortcomings that it did have prevented it from being fantastic as a whole. While there wasn't a whole lot of fanservice, there was a little more than was necessary. Could the show have been better? Yes, and it had a lot of potential. Was it a complete waste of potential? No, definitely not.
Would I recommend it to a friend? Yes.
