Originally Posted by
Ivolt
I personally love 5, and I've clocked over 50+ hours on it (and I'm still not done).
4 however, while I like it too, may not that what you're looking for. It's linear, and short (20-25 hours average without doing any of the sub-quests).
4 doesn't even have so much of s world map as much as it is a long path with interconnected points where you need to stop. It is easier to go back and do the extras in 4 though. (You can go back right from the final boss instead of playing the game over.)