Having said that, there are a two things about XIII that is driving me a little nuts.
First, money. Money in this game is… incredibly difficult to obtain… and extremely easy to burn through. Equipment upgrade is straight-forward in that you use loot/items to level the equipment’s statistics up; therefore, to be fair, you can go through the game without having to spend a single gil and utilize nothing except drops. The reality is, however, it is a lot more efficient to use gil (a lot of gil) to buy these materials in bulk and apply them at the same time than to use them as they come. Only problem is, there is no way to efficiently make money before you reach the final dungeon.
Second, enemy database. In XIII, what was one of the most useless ability/technique in past FFs becomes extremely important: Libra. Given that you only control one character during battle, the other two characters are AI controlled. The action of these AI characters will change to exploit enemy weaknesses once you find them out through casting Libra or fight the same enemy enough times. The information unravels slowly, so first you learn the enemy’s HP, then elemental weakness, status abnormality resistances, drop items, etc. gameplay-wise, this is not a problem. However, when you open up the enemy database in your menu, the game put checkmarks next to the name of enemies whose information have been completely discovered. Thus, if you’re a perfectionist and wants a checkmark next to every enemy entry, you need to be extremely wary of the fact that most enemies in the first half whose data you forget to obtain will be lost forever due to the one-way progression of the game (this is one of the reasons that prompted me to start my current run-through).
Same thing with treasure chests and certain monster-specific drops, but surprisingly they’re not that big of a deal because, 1) all regular equipments are, to the best of my knowledge, purchasable, and all non-purchasable exclusives are in places that you can revisit in the second half of the game, 2) exclusive miss-able monster loot used for equipment upgrade don’t give any exclusive bonuses, so you can always use different loot for upgrading, and 3) there’s no item/equipment database, whew.
All in all, I think FF XIII is an incredible experience. As a part of a series that have been reinventing itself, trying to compare XIII to other titles is like comparing apples to oranges. Some people like to focus on plot, some on graphics, and some on gameplay; I personally take the game as a packaged whole with an open-mind. Looking at XIII in this way, it succeeds in maintaining the one single consistent element that has been passed down from each title in the series: fun.