Honestly, it's mostly the cinematics that are bad. I haven't even played SO4 yet, but IU, while it grew me as long as I didn't run into cutscenes, does have some of my biggest issues with modern RPGs in full force. There's invisible walls all over the place, poor ones at that, and while the first village you go to isn't bad to explore you quickly go to a city that is more or less just a road that leads to a castle, and the castle itself is, I believe, 3 corridors in a hook/J shape with a few rooms branching off of them. This is especially bad since one the things that drew me into RPGs in the first place was the ability to explore a world, and IU in particular looked and sounded promising.
I guess that's why they call it the Infinite Undiscovery.
Also I wouldn't count on Graces until it actually makes it out here. Nam-dai-co is infamous for not putting forth any real effort to localizing their RPGs. We haven't gotten any of the Handheld Tales of games aside from Radiant Mythology 1 on the PSP and that crappy port of Phantasia on the GBA. The console Tales of games fair a bit better thanks to first party efforts from Nintendo, Microsoft, and Sony but we still have yet to see Destiny 2 show up in any shape or form (I'll take another crappy GBA port if that's what it takes) among other things. I wouldn't count on the PS3 port of Vesperia or that VS. game to show up either.
Nevermind the rest of their RPG series.
In the Wii's defense though you can play games like Ogre Battle: March of the Black Queen, Secret of Mana, most of the Zelda series, Super Mario RPG (and Super Parer Mario I guess), and other VC ports. Also some original stuff like FFIV: The
After Years, Fire Emblem: Radiant Dawn, the upcoming Muramasa: The Demon's Blade (assuming there's enough elements to consider it an RPG), FFCC: The Crystal Bearers, and so on...
The tl;dr of this post is does anyone think that IU is better or worse than Opoona (or that the XBLA has a better or worse selection of RPGs than teh VC)?