Dark Souls

PvP currently isn't worth it; too many people have hacked their way to max SL and too much broken scaling/weapons/spells, I would wait for the patch before doing that. I'm currently on NG+++ SL197, and Lightning weapons are still stronger than anything even though I have 50STR/50DEX.
Glitches currently include:
Moonlight Butterfly Shield scales with weapon attack, not INT, leading to retarded damage (1500 per hit long range)
Greater Magic Shield is currently 30 second godmode, instead of just nullifying magic is nullifies EVERYTHING.
Fog Ring. Enough said.
Crystal Enchant from Logan in Dukes Archives, put on Stone Greatsword, makes its 2H R2 give you a ~30 second aura that does 300-400 damage per second to everything around you, as well as adding a Tranquil Walk of Peace effect to the aura. (Stone Greatsword 2H R2 is TWoP, but it doesn't move with you and it certainly doesn't do damage)
Dragon Covenant. Just about everything about it; you can dupe with it, the fire breath is screwed up, the dragon eye summon is messed up too.
There are a few other glitches but you get the idea, things are broken right now.

Final boss is a fun fight. Not difficult since

 Spoiler

you can parry him

, but still fun.

Yep, IGN retardedly explained how to do the infinite souls glitch and won't take it down...It's their way of telling the devs to fix it. I wouldn't be surprised if the Devs keep that glitch in there and IGN ruins this game LOL

Those other glitches you listed though seem pretty damn brokenD: I prob ran into a few without realizing. Ring of Fog isn't much of an issue for me though..unless the area is really dark. Pretty bad for darkmoon covenant guys since Anor Londo becomes very dark when invading with the ring.