I've played over 300 games as Eve since her rework and in some games I'd do ridiculously good or ridiculously bad. The reason? Pink wards...stupid pink wards, everyone claiming Eve was OP before nerf weren't using pink wards efficiently, the philosophy behind Evelynn was to rush in, get your kill, rush out, but that was countered very nicely with good warding, giving you the edge to slow her forcing the W and not letting her escape.
Now? She doesn't feel like an assassin at all, As the OP mentionned, the change to the Ult killed her ability to get a kill before stepping into team fights and when it drags on you're out of mana faster than any other assassin class.
I'm unhappy with the changes because I don't feel it was tackled the right way, she needed tweaking, but not the whole change in her playstyle which doesnt feel as smooth.
She's still viable to pick, but probably not in high Elo games, curious about the stats after nerf over there.