I liked the combat, it was a mix between action and a slow realistic approach (sort of like Arkham Asylum but less show-offy). But it was, as everyone said, horribly easy.
Minigames and sidequests and NPC interactions were incredibly unnecessary and unfun. You never want to do them, unless you want to progress the game because of the 'you need x amount of points to continue'.
Environments were small and empty, they were jokes in liveliness compared to most other RPGs. NPCs are especially horribly forgettable.
Customization was a joke, because clothing has no purpose besides look -- nothing changes armor rating -- and because clothing and weapons are expensive as balls anyway, you never go use anything but your default "Hero" weapon that levels up with you, and you look the same the entire time. (Want that hat? Costs you 30,000 gold, or roughly 35 minutes of doing a minigame perfectly. No, I'm not joking.)
There's more, but I forgot it. I stopped the game around the time you usurp your brother and learn of the evil force, I stopped entirely.