You're going to have to upgrade your firmware anyway, so why not upgrade to something that actually cares about basic functionality?

Some people unused to open source solutions sometimes have this idea that all software developed by enthusiasts by necessity is hard to use or require tinkering, but that's not a fair picture. When developers share your interests, that's when software gets usable. That interest might not always be UI, but sometimes it is.

OpenWRT (and friends!) is clearly much easier to use and delivers richers functionality than any of the software it replaces. If your router is listed as supported, go for it.