This game is absolutly amazing, one of my favorite rpgs, it is on top alongside skyrim itself and fallout new vegas...
your choices have consequences, you are probably gonna cry at the end
the exploration is rewarding, every nook and cranny have something worth exploring (hmm, I wonder what there is in that corner, mountain, place with no quest whatsoever, and then you find an unique set of armor or an orb that giver xp haha)
the difficulty makes sense, you are not gonna be able to explore evey single place at the start, not because there is invisible wall, but because the enemies in certain areas are harder.
I hope AAA companies take notes on this game...