Grand Lackey Erkh - While he is neutral and sort-of useful in singleton decks, his main purpose is to crank out lots of 4/4s after Dark Pharaoh Tekahn has been played. This means that his tier will likely never exceed Tekahn's. I'd put him at tier 4 currently and can't really see him going above tier 3 unless something miraculous happens.
Sky Gen'ral Kragg - Auto include in quest hunter and for that he merits tier 1 status. Use in other decks is nebulous though as quest druid and quest warlock don't need it, quest priest doesn't want it to pollute the rez pool, and quest shaman and quest rogue got power crept out of the meta. For those Galakrond rogues who are still running the quest, stop as it's not worth it and you're making everyone look bad. :P
The Amazing Reno - Auto include in any viable non-aggro mage deck, which at the moment is only singleton mage; a tier 3 deck. Reno is tier 2 by being a staple of a lesser deck. If mage goes up or down, his tier will follow.
The Fist of Ra-den - Shaman is in a bad bad state and Ra-den isn't helping much. It's not a bad card, it's just that it's in a bad class. It's tier 4 at the moment and will be until the meta gets turned upside-down and shaken again.