Yeah, I just have a hard time with making a spec that is designed to level, rather then to 'pvp' or 'raid' with, so talent that are purely designed to level with aren't really high in my priority list.
Now, don't get me wrong, Corpse Explosion isn't purely designed to level... it has great use for AE tanking and it can be a blast in pvp... but for Arena/Raid, Corpse Explosion is a 2nd string talent who you'll only ever use if you're the AE tank or to clear pack of mobs (But then you'll be competing (and losing) with mage and lock for AE damage).
So in short, I need to give it another try.