For me, the dual camera is only useful for portrait mode (live photos). Sammy's implementation is better than Apple's here. Otherwise, the second zooming lens doesn't suck so much as it's just not as good as the main shooter. But it does kinda suck (same is true on Apple's 7 Plus). I've said this before: LG's implementation of the dual lens is the best on the market. Other than that instance, I think the dual lens craze is stupid and hasn't really added much to the photo taking experience on these devices. Especially when you consider the Pixel is probably still the heavyweight champion smartphone camera as of late 2017.
I agree, when I had my G6 I got some amazing shots with that wide angle lens. I wish all OEMs would adapt that strategy than the zoom/portrait mode lens. While I'm intrigued by the V30, I'm really loving my Note 8 and don't see me switching unless LG offers something truly amazing with the V30 (hardware wise or price wise).