Well i believe that any show of any genre CAN be fantastic, it's just hard. This genre makes it even more difficult.
But most of these shows all try different things. For one, and i believe QB does this part right, is understand what you are and go all out. This show is an all female action show with clothes being torn apart at all times SO there should be nudity, don't try and do this random shit covering the body stuff. Ikki Tousen tried that and even they eventually brought out the nudity 3 seasons in, so just go for it.
Qwaser took everything a step further and made the sexy perverted stuff part of the story, yet tried their damndest to keep it serious which worked for a bit, especially with the shows high quality and good fights, but at some point you can't keep a straight face man.
All that being said i think something like Sekirei does it best where they don't blow everything on the budget, yet still have a high quality show, great fights which IS important for an action show, nudity when they feel like it but not overbearing and is both serious and lighthearted. Good mixture overall for that one.