As long as it's not 7.0 or 7.1 (pre malefic?) when the only time I could shine was in Elerethe (mostly due to legendaries, but you get it) I like these changes.
MG is only good because it feels powerfull, but I want to try the other options. WiA is only good in cleave and now we have something going for Haunt as well (but tbf haunt in it's current iteration in ptr is gonna be the 100% pick just like MG is right now, because MG there turned to crap).
It may be a nerf, but I stopped caring about nerfs as long as it's not overkill. I just want to play a spec I enjoy now putting good numbers, doesn't need to be the best numbers.
But I do advocate that warlocks as a pure should be in the top 5 of E V E R Y fight. We have 3 specs, one of them should be different enough of the others to make it to the top in every encounter.