I played yoyo subclass this time and my favorite boss added by Calamity is probably Calamitas Clone, Plaguebringer Goliath, or Devourer of Gods, honorable mentions to the Ceaseless Void, Polterghast, and Astrum Deus
Yeah those ones are really good, DoG and his minions especially, lookswise. I always play ranged with every accessory having warding because I can't dodge for shit. I love Astrum Aureus (The Astral Infection is definitely the best idea of Calamity imo) and DoG most, and I like Providence for her theme even though the neghealth attack is really frustrating and the meatballs she spawns in at low health are kind of stupid.
I wish they would improve death mode and make post-moonlord not so grindy and annoying. If you ever play again, I'd recommend to use Calamity Extra Music to make early game and hardmode bosses feel so much more fun to fight, here's an example of one of the songs in it:
sorry kind of tl;dr but Calamity is one of those games that is really special because of countless playthroughs with friends.