It isn't even funny how much ToS destroys SO3, imho, ESPECIALLY the combat system. SO3's combat and AI are nigh broken. I cannot count how many times my guys have gotten close to dying because they use their battle skills (which drain their HP) or their magic (which drain their MP) to the point where they have almost nothing remaining. And if a character's HP or MP hit 0, they die. So sometimes all it takes is an enemy whack or enemy battle skill to deplete their final HPs and MPs. It's so freakin' stupid. I just camp out as Nel, the most boring character to play as, and worry about healing my guys up. Yawn, yawn, yawn.
Sadly, my other two guys, both melee fighters, periodically enter "dead moments" where they'll stay in a far off corner of the map and do nothing until either an enemy approaches, or I run over and nudge the morons to action. Half the time Fayt just freaking sidesteps (hops) from one side of the arena to the other, doing absolutely nothing. And this is after disabling all his spells so that he SHOULD only be concentrating on sword brawling. It's absolutely ludicrous some of the situations I've found myself in.
To make matters even worse, I've just defeated Shelby, saved Nel and her two stooges, and wound up with so much money in my pocket (since there have been almost no stores or equipment upgrades to speak of), that I was able to return to Airyglyph (stupid name) and blow about 40k Fol on buying Fayt a Holy Blade and Nel an Osprey Dagger, which, my guess, are weapons I probably shouldn't be using for a at least a couple dozen hours from now (I'm on hour 13 now). Frankly, when they do decide to fight (when the AI allows them, that is), they now mop up just about any foe in seconds flat. Yikes, Fayt's only level 20 but he's doing about 1000 damage with a major strike... lol. Oh well, I think I broke the early hours of the game now... at least until the monsters catch up.
Also, strangely enough, in the freaking Airyglyph Aqueducts all the way in the beginning of the game, a monster netted me a random drop, an accessory (Restoration Symbol, I think it is called?) that restores 3% of my total MP every couple of seconds in battle. Nel, being my primary healer/mage, has it equipped, and now that she's at level 16 with about 460 MP, she actually gains more MP during a fight that I can possibly use by spell casting. It's a good thing I didn't camp the Aqueducts until I got a couple of more of those accessories. The game is either pathetically easy or "artificially" challenging, depending on how retarded the AI is in any given battle. Really, this game is totally broken.
That said, I do like the characters so far, and the story is pretty good. Both (characters and stories) are leaps beyond what ToS had. ToS had a great, great art style, very nice looking combat graphics and monsters, and lovely (non-world map) environments. But it had a truly hideous overworld. SO3's graphics are almost universally gorgeous, if occasionally generic, and largely has very nice texturing (except when the game zooms in at rather unfortunate moments in cutscenes.) But the gameplay in SO3 is all kinds of broken, and that's why, in my book, ToS takes the prize. Frankly, I'm surprised that SO3 has scored as high (relatively speaking) as it has, in reviews. It's almost like Tri-Ace/Square-Enix didn't even bother to play-test the game... Pity. I was such a huge fan of SO2.