Nebulous
Legend
I don't HATE anything, because I long since reached the conclusion that "haters" are a corrosive influence on the RPG community and they should either STFU or GTFO.
And I find the initiative system, basically unchanged from 3E, rather annoying.
The concentration mechanic could be better. Game balance took a giant dump on fun, there.
And the "rulings not rules" approach seems to be a blanket excuse for sloppy writing throughout the text. The authors should have clarified their intent, not just written off every single vague rule in their books as something to be decided by the GM.
And in spite of all that, 5E is still the best version of D&D I've seen yet.
Initiative i don't like either, and I saw a thread here i'm going to try using cards as Initiative, i think that might be how the Fate system does it and it seems like a streamlined yet tension filled alternative that will work. And yes, some of the rules are just too vague and streamlined for my liking.
ALSO...after 7 months of playing, myself and my players are absolutely not pleased with how the PHB is laid out and lack of easy tabs or markers that make browsing to sections easy. But this is just a quibble and nothing close to "hate" and the ease of houseruling 5e is something that is highly enjoyable.