I kind of enjoyed it but felt maybe Carnage should have escaped instead of what happened. He was in prison in the beginning of the arc and he went back to prison in the end. No difference really beyond the lobotomy. Thankfully, they didn't kill him like with what Sentry did earlier. I think Flash's reluctance to kill is perhaps his time with the Avengers and the inner Spidey fan in him tht wants him to not kill people like that. Sure, he has killed before but usually its out of provocation or anger. Carnage was beaten here and Scarlet tried to finish him so I think Flash had an objection to that.
A good run and loved Carnage going 'Not-Spider and Not-Venom' since he seems to think of them as pale copies of the originals.