I think people are underrating the effect of automatic crit confirmation, it's a fair part of the Fighter captstone ability for a reason...
I'd also say that doing away with opportunity attacks makes it tougher to defend the squishies because the opposition can run straight past the melee classes to attack them.
As I run BB E5 I'm not worried about capstone abilities. The latter is a feature not a bug IMO, I want to see the squishies worry more - why should the Fighter take all the pain? And nobody in PF is all that squishy anyway.
Re Trip - well Trip is massively overpowered in 3e/PF in my opinion; the wolves still get +2 to hit a prone opponent AIR and that seems plenty to me.