Absolutely loving season 4 so far (besides episode 1 which I just skipped by this point - did not like that episode or the season 3 finale).
My ONLY issue came at the end when the bad guy was impaled with a full speed truck and barely seemed to leave a scratch or cause any blood. Come on, you showed the truck hitting him so well, you could've not showed the body on the ground after and all would've been well ha.
I quite liked seeing Hotch interview him too, shows that they're not infallible and that they too can skip things. Especially because this guy was so good, he automatically assumed they were bad = FBI and not victim, he had 'customers' come in that he could seem nice to and he just acted believably normal.