In my opinion, yes. However, everyone's tastes are different and you'll find plenty of people who loved it as well. I've been a Final Fantasy fanboy for a long time and FFXIII just broke me. Final Fantasy as a franchise at this point is a shell of its former self. FFXIV was a big disaster at launch, and even after ARR it honestly didn't have a story hook or gameplay loop to hold me and I can't be bothered to wait until it gets good. FFXV I was kinda hyped for, as it was a promise of FFVersus XIII which was kind of the FFXIII we wanted but never got. However, I dropped that game after 5-7 hours as it just bored me. With FFXVI being basically FFXIV single-player with a dash of FFXII and FFXV, I'm never really finding any excitement about FF. It could always change with new footage, but the era in which FF was at top is long past.
FFXIII or the whole Fabula Nova Crystallis series seemed like ambition getting to someone's own head. Still FFVersus XIII looked so fucking good and fun compared to what we got with FFXV or FFXIII. I wonder how the other timeline where FFVersus XIII was made is going.
Honestly, Square Enix should make an experimental FF spin-off series where they give mid-sized teams of creative people the ability to attempt being really creative in terms of producing FF games. Give into creative explosion, using various teams. Fuck, hire Yoko Taro for an edgier project. Hire someone else for a more classical and fantastical one. Get pumping out these games until you hit gold again. That was kinda the good part of the formula, the ability to keep something mainline staples, while constantly reinventing yourself.
Also, please more focus on your party, on a tactical combat system, on locations, clever world building and sidequests. On moment to moment gameplay and story progression. Also don't try too hard to copy whatever is "modern". Don't be afraid to try out different art directions and stylization.