I have to disagree, Rob, I think the colors and brightness work well (though I do agree about what Blizzard said)-- and in terms of darkness, ahve you tried cahnging the settings? I don't think I've had an issue with not being able to see paths and chests. Though I do agree, the camera can be frustrating in multiplayer. On the other hand, coming off of Daggerdale, it's like a miracle. I also think the online coop is designed for playing with a close group-- it does have a 'proper' component, it's just not the Diablo-style "jump in with anyone and kick some ass."
I think it's going a bit far to call the balancing in combat a "flaw." It's part of the design-- and in my experience, it's pretty evenly balanced to build your focus-- if you run low, play hit and run with a longer-ranged attack to build focus, or dodge a bunch of attacks to build up a power sphere and heal yourself. It can be difficult when you've got 5 HP and low focus to swing the fight around, but the satisfaction from doing so is pretty high, especially since it's a little more based on reflexes and skill than numbers and potions?
TL:DR: I can see where you are coming from, but I don't totally agree. Should make for good podcast discussion.