Completely fair... ok, but I like the idea of cohorts with ws3, and skirmishers ws2, it sounds logical (it reminds me the Lustria book in 7th).
In the same way, ws2 on ripper is just a shame (but that was before too). We already have the worst monstruous cavalry in the entire game in term of stats: T3, 2 wounds, and in combat the ennemies hit against ws2... Rippers are too expansive now, with their nerf (less attacks and no reroll). That was one the things that shocked me with the 8th army book. Look at the model of a saurus warior, and then a ripper: the first is T4, and the second, T3? oO God damn, wtf?
Finally, Born predator is a very good rule, better than before. But why aren't the carnosaur and rippers born predators? It sounds so weird.
Except those points (and of course the slann, but no need to talk about it again, I just agree with others), I really enjoy the work on this 9th age!
Hasael.