People seem to only dislike the game because they feel they have to, really. It's hard to ignore all of the blind Square-Enix hate, just because it's the cool thing to do. Well... to what seems to be a vocal online minority, anyway. Sort of disappointing. Why can't we just give all games a chance?
People have been saying strange things about the game since it came out, like "The game has no strategy", which I can't seem to understand. I'm pretty sure quickly switching between paradigms (and making them, choosing a character, and levelling a role for each character, for that matter) for the characters' survival holds strategic value. It's actually pretty dynamic and strategic, but no one gave it a chance outside of the tutorial zone to see this. If people don't want to use the auto-attack button, then they shouldn't use it. They have an option. It's the same thing as when I was watching my cousin play Forza Motorsport 3 and he used the rewind function and said "I hate that racing games have these now" but didn't have an answer when I asked "then why did you use it?"
They also tried really hard to say the game had plotholes, when the ones they came up with were all actually non-existant. SPOILERS: ((("lol, if lightning gave away her sword, then why does she have it in the beginning?" Yeah, try looking in the first cutscene in the entire game. "Lol, if sazh shot himself in the head, why is he still alive?" Really? if he's still alive, then he didn't shoot himself in the head.)))
The music in the game was actually pretty engaging and memorable, I thought. Most of it's made by one of my favorite composers Masashi Hamauzu, and I love the way he composes music. Also, the way they inserted music, the cinematography, was amazing and gave me goosebumps a lot of the time.
I loved the world and design of ffxiii's world. it was all really beautiful and highly detailed and just the style I liked.
Honestly, though, the story had potential to be darker than it was. I was hoping for a darker story, something like FF7 dark, but I'm okay with the story as it is now, honestly. Also, I wish I understood how the characters are all just archetypes, as people continue to say.
It's okay to not like the game, but I get the feeling a lot of the people I see online only dislike it because they feel they have to. Just give this game a chance. It's actually pretty nice. Maybe not the best game ever, but it's still a nice one to have in your arsenal, I think.