To be frank, I was brought onto this anime when I had heard the character designer from Re: Zero was a part of the crew. Twelve weeks later, and I'm left fairly impressed with how this project panned out.
The show is very much divided into two parts; the fights and the spaces of time between said fights. These intermittent periods are the show's bread and butter, as each girl has a fleshed out reason as to why you'd want to root for them. (My favorite would have to go to Nene- the 20 something year old middle schooler). Granbelm is a show with REAL STAKES, and REAL CONSEQUENCES; whenever anything happens, its implications and effect remain prevalent all the way until the end. Very reminiscent of Madoka.
Again, the character design is done by none other than Shinichirou Otsuka, who might have very well balanced moe faces onto disturbing places. Big props on that department. As for the mechs, while they may not look all that aesthetically pleasing, they sure do leave an impression. They somehow remind me of the Kirby games, for some reason.
If you're a fan of Re: Zero, Madoka, Battle Royales, and mechs, it wouldn't hurt to pick this show up for an evening binge. 8/10