Dark Souls: Finished. The final boss was without doubt the easiest boss in the game, easier than Pinwheel, easier than the tutorial boss, much easier than the bonewheel room the the catacombs (if I got a legit death, it was from that room). Block his first attack, parry the second, and stab him for 800 damage. Repeat 5 times. Completely predictable. If his grab was faster, it would have been scary.
Hardest boss was probably Capra Demon. Poizn dogs makes the fight 5 times harder than it needed to be. Four Kings and Bed of Chaos are gimmick bosses. Seath is owned by curse resistance. Nito is a joke; didn't need divine weapons here.
The real difficulty in this game is dealing with the environment, narrow passageways, archers, bonewheels, input lag and a terrible camera. This game has some of the best designed areas (Anor Londo, Duke' Archives, Catacombs) and some of the worst areas ever in a game (Lost Izalith, upper part of Blighttown, Tomb of Giants).
Combat is sweet and rewarding when you beat an enemy or boss on your own and co-op is fun. I'm not into PvP until they remove/nerf the ninja flip ring. Way too many havel armor users moving like a thief, complete with impenetrible poise and defense. They fixed all the other broken equipment.
Overall, I think the game is a 7. I think a mandatory install would have fixed all the lag and framerate issues and no friend co-op is lame.