I was a huge fan of the Advent Children movie. Then, after learning that a game was about to release, that had action similar to AC, I started to look into it.
I remember looking up Dissidia trailers and gameplay videos with my brother on GameTrailers, including one very funny instance of accidentally layering duplicates of the Bartz' vs Exdeath cutscene with a slight delay.
The game looked so cool that it convinced me to buy the silver PSP bundled with Dissidia and the Advent Children UMD, which I still have to this day (still operational). Once I started playing it, I fell in love, and it actually acted as my gateway to play more Final Fantasy games, since I had only had a minimal amount of exposure to older FF titles via emulators. I also eventually bought my brother a PSP and his own copy of Dissidia. We played against each other several times every week.
As 012 Duodecim released, I immediately jumped on it day one and loved it more than the original. The gameplay had been fine-tuned, and the aadded characters were great. Especially Lightning and Tifa, who became two of my most used characters, next to Squal, WoL, and Tidus. My brother and I, as well as 2 of our friends, would play it every time we hung out, my brother and I continuing to play against each other at least a time or two every week.
Eventually, we moved on to the Vita, but would rebuy Duodecim digitally, to play from time to time.
With the impending release of NT, and my disappointment with the very different direction it has taken from pre-established "Dissidia", I am going to pick Duodecim back up to quell this betrayal I feel from Square Enix. I even regret buying Final Fantasy 15, a bit. I'll probably finish 15 eventually, but only after my disdain for SqEnix dies down. I just find it sad that they would take the series in such a drastically different direction, saying "screw you" to those of us who wanted a sequel to what what was already established across two entries for some aspirations of esports grandeure. They really shoud've given NT some non-Dissidia title (is suggest Manipulus or Equitus, latin words that have to do with "teamwork") and eventually made a Dissidia sequel that actually feels like previous Dissidia.
So, at the end of the day, I'm a long-time, passionate (and now somewhat disgruntled) fan who's love and passion for the series has been rewarded by being left in the dirt, given a game that doesn't feel like Dissidia to me, and met with no choice but to miss the series that I put thousands of hours into during my teenage years and play the old entries.