I also think it's great. Only played two games on it last night, but I'm loving it so far.
I had no trolls, no fighting. In my first game, we actually talked about team comp, picked one that would stomp the enemy, and executed it nearly perfectly (to be fair, other team had a dc, but the champ select experience was super positive). In the second, we had two duo + 1 against the enemy trio + 2. Champ select went smoothly, again with everyone playing along and picking smart. Stomped again.
Trolls were in the old mode, too, so when I get them, I think it's unlikely that I'll think it's a consequence of the new mode. Everything to do with the champ select experience was great (except not being able to change ward skins. But they are already on that).