Revive animation takes too long in between. It is really frustrating picking each other up when you're locked in a standing still pose for awhile when finished reviving the other player and not being able to quick cancel. Majority of time that's how I've gotten down or killed.

I second this - releasing the revive button should stop the animation immediately.

A side effect of the current locked animation method is that even if the player doing the reviving dies, the other person gets revived anyway since the animation "continues". Seconds later even. Almost as if a ghost is reviving their friend!