Most FFs have superbosses that are rehashed skins from previous enemies/bosses. FF13 had Yiazmat and Hell Wyrm being the same enemy with different skins. FFX had the Aeons in a Dark Skin. FF9 had only one superboss, which was unique, I give you that. FF8 had Omega and Ultima too. FF7 had different weapons, each of them unique. 

This isn't a FF13 isolated issue, neither is it a FF isolated issue, since pretty much all JRPGs use the same enemies with different skins over and over again.  

I mean seriously, what happened to Yiazmat, Zodiark, Ruby Weapon, Omega Weapon, and the like? In past games the ultimate enemies felt like creatures you had no business fighting to begin with. Now it's a reskinned flying thing-a-ma-jig, and a regular enemy turtle with beefed up stats. Where's the epic? That huge mountain with legs would've been epic. That's such a cock-tease. I really thought that was going to be the big uber-boss.

Just like I said, of that list, only Zodiark and Ruby are actual different enemies XD 

Fighting Titan wouldn't be feasable. Think about it, a single adamantoise is enough to kill your team, and you saw the clip where he swallows one of those without any effort. 

 I know that this isn't "new" per say, but just the way it's done is very anti-climactic. In VIII, Omega and Ultima were the super bosses and they were the only two enemies that looked like they did. They were the super boss. VII had Ruby and Emerald, both unique. I don't remember 9 at all, , twelve had Yiazmat. It's not just the reskinning, it's the grossly un-epic re-skinning. It's not some super cool final mission 64, it's a regular enemy you've fought a hundred times before, but with more HP.

And of course it's not feasable fighting Titan, that's why it would be so cool. That's the entire appeal of the Uberboss. It's something you have no business fighting, but you buff the hell out of your characters for 20 hours and then go get shit done. I mean Ruby weapon was a skyscaper built by the planet to kill whatever shit needed killing, it took a massive cannon and the power of an entire city to shoot his little brother in the chest, and you fight him 1 on 1, man to man. Who cares if Titan ate a really strong turtle, let me highwind him in the face for a million hit points! Make some epic shit happen. Instead it's a butterfly with a forcefield, and another big turtle both of which I've killed tons of. It's not just the reskinning, but the horribly uninspired "quick put something in there so we can ship it" uber bosses.

Dark Matters drop easily out of Shao Long Guis and at 2 min per kill, it's going to take much less than I originally though it would to get the Treasure Hunter trophy

Actually I think that FFVII had one of the most anti-climatic super bosses in any FF, just like FFXIII. Both Emerald and Ruby were pretty darn easy to beat, Emerald with both the W-Summon + KOTR + Mime trick or the W-Magic + Quadra Magic - Demi3 + Mime and Ruby with the Dazers paralyzing trick.

FFIX had that giant marble for a superboss, Ozma. It wasn't very epic much as it was a big collective WTF XD.

I totally agree with you that the superbosses were botched in this FF. I guess they saw that too, and over compensated in the difficulty of supposedly normal enemies, the Adamantoises.  

Only advantages I see are either completion for the Treasure Hunter trophy and for bringing down Shao Long Guis and Long Guis much faster, since when they get to below 30% HP, things get pretty hectic if you don't kill them fast.

I just sold everything, worked so much faster. :D

Resonance of Fate - Neverland area is harder than all of this game combined >.

Hmmmm, i'll try that, but I still have so many weapons to buy/upgrade and at least 4 Dark Matters and 5 Adamantites to buy, which is a staggering 4.3 M. Don't know if selling everything gives me that amount of money, but i'm going to try it.