Note to all those having trouble with bosses and large enemies: Use block on all of their normal attacks, then when they double back attack them like with area combos to keep them at bay. When they charge up the strong attack when they can't get near you ready your L2 and x to do a front flip over them and then hit them either from above or behind, because there are connection attacks that are extremely potent. The best one to use is the somersault strike combo, which is basically Square x3 after landing the somersault (To all the smart asses, this is a strong combo and will save your ass with bosses and quick enemies you like to lunge). If you like to be an aerial artist then all you have to do is press grab in mid air and do the air kick. As for the somersault attack It has to be at the right moment or it will NOT work: (hint: you will notice your chain cross on fire while attacking the enemies in a wild fashion. It's an easy strong attack and ends your hellish battles with annoying enemies) After they are stunned by that clobber them with your strong combos. I just pulled it off right now against a boss and it worked like a charm. Also if you're in trouble or just want to use one of your items for fun always use the demon crystals on the bosses. It takes out an easy 25% of their HP away.
Cool combo tip for smaller opponents: Jump into the air and press grab. This hoists your enemy into the air and you can hit him as many times as you please. Hold Triangle to use the area strong attack and you will obliterate them on the spot while they are helpless in mid air as well after a custom air combo. I always use that on the ones that piss me off the most.
Another note: You guys really need to start exploring the extensive nature of the battle system. It's not as responsive as god of war, but if things are done correctly its more rewarding.