that's not a good question to ask me because I'm easy to please provided I'm in the mood for what the game is/offers, in fact I can enjoy pretty much everything as long as, again, I'm in the mood for it
FFXIII: it was ok, it get criticized a lot because of levels are linear (corridor simulator) and is basically designed to be played with the AI auto-battling as you micromanage/swap roles during battle (healer/tank/dps/debuffer/buffer) but as someone who wanted something simple it was fine, also I LIKE games with auto battle, every game turn based game should have it in some form imho
You don't really understand everything that's going on unless you read the datalog at the beginnigm, kinda messy.
FFXIII-2: it's marred by bad performance and crashing issues unless you patch it with community fixes, personally I just patched away the crashing issues myself since I'm extremely tolerant of persomance problems as long as the game doesn't crash every hour.
That said I thought it was more enjoyable than the first game, it's non-linear and has the same combat system of the first game, the main characters were ok and the non-linear approach is interesting. Some ending parts are a bit convoluted.
Lightning Returns: the combat system changes for the worse imo and the whole lore stuff is needlessly convoluted towards the end, the time limit is a pain and I blocked it with cheat engine because it was lame as hell and I hate time limits in my games.
It was easy enough that I could cruise along so it was ok. I thought it was interesting that the quests have mini-stories and some are connected with each other, all the stories seem to reveal a bit more about what's going on, they add a bit of background to the main story.
I can enjoy them but I wouldn't suggest to someone else, it feels like they didn't flesh out some parts of the lore/stories, or they had some ideas but could have been done/explained better.
The whole
Chaos lore-thing feels like it's a gimmick they decided to use but couldn't integrate well in the story