Death has been a solid force ever since the Legions of Nagash book came out. These changes don't make much of a difference to how the book already played.
Bringing back units for free is nice, but a cagey opponent can block your gravesites and prevent your models from re-entering the board.
I've been playing death for almost a year now, with my Flesh Eater Courts and I've won more games than I've lost. Death is very reliant on ita heros, so you've gotta be mindful of them.
I am curious to the changes my ghouls will have. If I can recruit models larger than starting unit sizes, flesh eater courts are going to be terrifying.