I tend not to like them because they don't generally flow that well. Some games manage to do it very well (Vampire Bloodlines was surprisingly nicely written), but for most narratives it's the same shape of convoluted in a darker color palette.
For example -- It's one of those very few complaints that I have with New Vegas. The Brotherhood were my BROS. Being a wildcard and letting them live wasn't a good choice or an evil choice... those bitches were my high-tech crazy asshole arizona minutemen border patrol that I didn't even have to pay. Gotta keep those fucking undesirables out if you're gonna run any sort of self-respecting wasteland empire. And those brotherhood freaks, they'd do it for FREE! But really, the "right" choice was to blow up the brotherhood bunker. Why? Those dudes know the score.