About as worth as being a fan of any series of media releases, sure. Which is to say, nothing wrong with being a fan, just don't be a blind fan.

They've had their ups and downs, and opinions will be opinions so it's going to be different for everyone.
FFXIII-2 and XV might not have been amazing, but they'd still easily make it into the top half of my ranked FF games list. XIV had a rough 1.0 launch but was great again post-2.0. WoFF was great.

But hey, there's nothing wrong with being disenfranchised either, as long as you don't put down people who aren't.