To be honest, I like their hulking appearance. Generally, I'm not big on muscles, but the Qunari are a very laborious and self-sufficient race. To top it off, they seem rather prone to muscle accumulation and retention. Combine both those aspects with the fact that the Tal-Vashoth inquisitor starts off as a mercenary from a very fringe, self-reliant community, it makes sense for them to have bulk. Qunari are "giants," and I've never seen a lithe giant in any form of media, unless maaaybe if it was starving to death perhaps?
Yes, I won't disagree that it would be nice to have sliders for body shape, but BioWare has already stated that they can only have so many rigs so that just isn't an option at the moment. I will also agree it is difficult to look at a male Qunari and think "rogue," if only because that typically holds the connotation of this slender and swift individual. Qunari can be swift, surely, but slender they are not.
Though, I will forever be eternally grateful to the designers that the Qunari female isn't just a conventionally pretty human that happens to be tall with gray-bronze skin, pointed ears and horns. Looking at you, Rasaan.