@gnitro I've only watched 2 of those.
Princess Connect Re:Dive was cute and entertaining, but didn't really make a lot of sense. It probably makes more sense to those who have actually played the game. What's interesting about it is that the protagonist is the least interesting character, until the last couple of episodes.
Death March is a nice subversion of the isekai harem trope. The protagonist gathers this following of young cute girls, but has no romantic or sexual interest in them; he prefers more mature women. He just wants to give them a chance to have a happy and fulfilling life. Otherwise pretty typical power fantasy.