That is subjective, and you need to be able to run 5760x1080 consistently above 60fps for it to be worthwhile. Need a lot of GPU horsepower to pull it off. Many people are satisfied with anything about 24-30 FPS.
I would say it is worth it if you are willing to pay for it, but I think now isn't the best time to be monitor shopping. Major transitions kicking off with 4K, G-Sync/FreeSync/AdaptiveSync, and IPS/IZGO screens becoming gaming friendly.
Been doing a lot of research and shopping for a G-Sync monitor, not really willing to pay $800 for what is available now. Already have a 1920x1080 27" screen, and that has been doing okay for a while. Quite a few reasonably priced G-Sync 1920x1080@144hz monitors at 24" and 27". 27" ROG Swift at 2560x1440@144hz would be nice, but too pricey. Going to see what competition brings to the table. Some of the 28" 4K monitors are nice, but they are limited to 60Hz.