D&D General What are the issues with the 2014 Subclasses

I've been working on my own custom version of the 2014 D&D rules, and I'm looking for problems, oversights or outright abuses with that version of the game regarding the various subclasses so I don't get caught flatfooted by them in my custom rules. This should be restricted to WotC only content, of course.

OP stuff like twilight clerics and crap like the berzerker.

Find a tier list and aim for B+ to A levels imho. Older dungeon dudes subclass tier lists are a decent place to start.