I'll just quote what I thought of FF13 from another post.
From: pyrzi | #009
It's a bad game really. Nobody should have to wait 15-40 hours until a game becomes entertaining and interesting.
How are these issues adressed in 13-2?
The mark of a mature man is a scar he bears; The memory of a perfect woman never won, or a once-true love forever lost. He is only here because she is not.
-No slow moments. Final fantasies(at least 6/7/10/10-2) were rgeat because there were fast-paced moments(combat-heavy missions and quests) combined with slower moments(being in town and talking to people to find out stuff about what's going on, gearing up to the next dungeon etc). FFXIII is combat combat combat combat cutscene combat combat cutscene combat.
FFXIII-2 is definitely better about this. Combat is nicely broken up by a variety of puzzles and sidequests.
-Curbstomping opponents is extremely limited. It won't happen often.
It's quite possible to become much more powerful than the enemies. In fact, it's almost too easy to become overpowered.
-No revisiting old areas apart from one(which is the exploration area I mentioned earlier) for hidden secrets, superbosses etc.
You can revisit everything, and you can even reset the main storyline and replay it in almost every location (one of the locations is bugged--you can reset it but the storyline quests don't work).
-TOO DAMN MUCH MECHAS
This one's pretty much the same. Didn't bother me, might bother you.
One thing I did like is that it's challenging. I've never had so many game overs in a game that isn't Demon or Dark souls.
If you let yourself get overpowered, you might be disappointed by the challenge level of the enemies in this game, especially the postgame enemies. You can retain challenge by watching how much you level up during the game; I found one stage of the Crystarium per storyline segment to be a good rule of thumb.
That said, most of the DLC battles more than compensate in this area; Gilgamesh and the Valfodr sequences are among the hardest fights in all of Final Fantasy.
The fixed all the "problems" from FF13 but in doing so made a really crappy game.
The game isn't linear anymore, you can choose worlds but the worlds are all meh and they make you revisit them over and over and over and over again.
The story has multiple endings but it's swallow.
Without the characterization of the 1sts game linear story, the characters in ff13-2 r meh and boring.
Overall I just stopped playing the game.
people whined because FF13 was linear and boring because it was all battles and they couldnt revisit places
people whine because FF13-2 is anything but linear and boring because they have to revisit places
people simply are never happy...
I haven't finished this one yet, but I've gotten fairly far into the story and while I enjoyed them both, I consider this one to be superior...
THE DUDE ABIDES!
I personally think ff13 is the better game, but ff13-2 does have some elements that are better.
To put some things into perspective.
The area that you can explore in ff13 is probably bigger than all of the combined areas in the entire ff13-2 game. This is because there isnt that many areas in ff13-2 as many are duplicated multiple times.
Character and equipment customisation in ff13 is far superior, as well as strategy.
ff13-2 quests are however much more varied they are not just go and kill something.
ff13-2 does have the casino style area seen in many rpg's, whilst ff13 does not.
ff13-2 does have a good monster development system to help compensate for the lack of proper character devleopment.
ff13-2 allows you to replay all boss's after fully developed etc. so is sort of a new game+ mode in that affect.
ff13-2 has super boss's via DLC although these are probably equivelent to super boss's that were in ff13 without DLC.
also one last thing the fragment skills that you get in ff13-2 are pretty neat the ones that aid farming etc.