I like SOME of the environment reactivity. The boulder trap at the Goblin fight actually surprised me the first time and made me gag.

I don't play Bard, but I love the interaction of the instrument sound when spells are cast.

I like the detail in the Channel Divinity for Clerics with the deity symbol showing.

I enjoy that it is up to 4 players. Other games that are competitors really lose out on this, especially Pillars of Eternity.