Around the FF13 series, it became quite apparent that they were only trying to dovetail off of Cloud and Co. Lightning was the definition of brooding...more so than Squall. Except Squall had a reason, he was an orphan/military brat, Lightning was a living weapon with people who supported her and she was coming off more emo than a Black Veiled Brides album.
I actually liked FF13-2, it made me realize that we needed less Lightning and more supporting characters. After those three "meh" titles, I knew it wasn't going to be long before they tried to relive the "glory days" and once I saw 15 I knew it was gonna be a massive let down (character/story wise). They honestly need to take a break from the "Cloud chasing" and focus on longer, meatier, franchises like I am Setsuna.
The FF series can take a break, we need some new leads who don't look like Sasuke with the demeanor of a 17 yr old emo kid from high school.