AD&D was fantastic...for its time. I started with the original blue box Basic Set, then moved on to AD&D which I played for many years (still have all my books, modules, Dragon magazines, Judges Guild supplements, etc.) Starting with 2e, I thought the game got more and more bogged down in min-maxing characters. There were improvements with each subsequent release, but all in all I thought the feel of the original game was lost along the way. 5e is the first edition that, to me (and my group) feels like AD&D but with better overall rules. No more THACO hit charts, magic users can wear armor (well, multiclassed demi-humans in AD&D could wear armor...), and the list goes on. I loved playing AD&D, but there's no denying its many flaws.
5e has its issues, too, but overall it's a very good release. D&D is fun again.