I would like the TTK to be reduced as well and no more than 2 punches to take someone down. However, I do notice that D2 Crucible requires more tactical choices when the other team runs a 4 man group. The maps have more choke points than D1 maps had and many ways of getting out of a squeeze. You have to find ways of getting the other team to split up. Stay on the move. Don't engage a group alone. Start following your other teammates and form a group. I noticed the other players on my team would seem to realized they need to group together after getting slaughtered running alone.