Chakax - he's something like 350+ points if I remember correctly, and he has a... 5+ ward... (not even a 4+, I mean come on, he costs more than a tooled-up khorne lord) and it works only in challenges (lol!), 3 or 4 S5 attacks.... how wonderful. His 'magic item / secret ideployment spying' abilities are kind of ok.
Oxyotl.... is going to do what exactly? Doesn't he cost about 150 points? As far as I remember he shoots 2 BS5 S3 shots which are poisoned on 5+, and can snipe at characters. How exactly is that worth 150 points?
Mazamundi - what disciplines doe she have? Soul of stone? So you mean that after spending 625 points on a Slann Lord I don't get loremaster, nor do I get +1 dice per casting, and he's now sitting on a combat monster which is vulnerable to cannons and is pretty much the last place he'd want to be. If he gave a 4+ ward to the stegadon he'd be considerably better, but I'd still never take him. He also suffers the ignomy of having a named magic item which does nothing - the shame!
Kroq-Gar is one of the worst offenders in my opinion. I mean they gave him a named carnosaur mount which they could have given some unique special rules or a better statline, and they decided the best option would be to slightly alter the carnosaur's frenzy rule. GREAT. He's also HORRENDOUSLY expensive for someone who will be swatted aside by any cookie-cutter High Elf, Dark Elf, Chaos, Daemon, Vampire, Minotaur, Ogre, or Dwarf Lord.