Ohayou. I dropped Strike Witches season 1, on episode 2. Like you, I'm not a fan of excessive fansevice (panty shots in particular). If you watch episode 1-3 of G and P. There's only one short fanservice swimsuit shot in all of those episodes, and only one of the girls did it because she's cleaning a tank. No panty shot at all in episodes 1-3, I assure you.
Another thing I liked about G and P is that the show is more connected to reality, in the sense that the girls use tanks that really exist. Such as the STuG, PZIV, M3 and many others. And of course, the main is cast have pretty much likeable personalities. As for the rest of the cast, there's some characters I dislike (saying the reason would be a spoiler) but the rest are ok.
Ok, let me tell you this, I really don't like a show where the premise is just a bunch of girls doing military stuff with a story which is not deep enough. I even hate it more if the show has some useless fanservice in it. The major offender from this genre is Strike Witches (especially season 2). I just can't stand that show. Fanservice abound, boring story, shallow characters and its main purpose is just to pander on otakus' many fetishes like panties, nekomimi, loli, little girls with big guns, etc. I was actually traumatized by it.
So, I have to ask, is this Girls und Panzer somewhat similar to Strike Witches? Or is it more like K-ON! with tanks? Or is it more like Sakura Wars/Sakura Taisen?