Drop Rate is what I'm mainly discussing here, but I'll put a side note to discuss other things like Crit rate and what not.
I don't think I would. If a MMO completely removed RNG. It'll have to do multiple things to make up for it.
1. Harder content (Usually not "Hard" just increased hp and higher damage migration)
2. Bring in crafting which essentially means "grind"
3. Slow or pack character progression.
I for one, enjoy the diversity that RNG brings. You could usually look at someone wearing a rare set and Awe. Because you think he's dedicated or hardcore.
Now Refining rate and crit rate being gone, would be indifferent to me. As I've played games without both of those and with. I guess Crit rate did make me enjoy it alittle more, so did Refining rate. But once it made too large of a different (League), I started to dislike it.Refining rate is nice sometimes, but things like Dragon sagas 19+ to 20+ only having a .15% chance, made me hate myself for investing so much time into the game.