Almost half of all legendaries in this game see no play. Blizzard neglects old cards because they're too concerned with making money with new cards instead of fixing older cards.
Some 'useless legendries" actually work in certain combo decks. Hemet, Jungle Hunter has its purpose. I had a 75% win rate by having this card in my Mecha'Thun deck. So crappy cards like this don't really need to be changed, because they have a purpose. But there's a lot of cards out there that just have no use what so ever or have been completely power crept out of the game. So I am going to try and buff a few
Most useless legendries just need stat or mana changes, but there are some that need their effects/battlecries etc changed completely
Please share your suggestions on how to fix various other cards