my biggest problem with the game is the power of the loot when you are 60 is basically the same as when you are 100
its a range from item power 690 to 820? also some of the needed aspects that only are on drops are too rare (my buddy only got the serration aspect for his necro a few days ago and he has played every day since launch) and that if you get a good item but it has 2 bad stats, you can only re-roll 1 of them and if you do it x times it starts getting insanely expensive (2.5m per roll starts to hurt)
This is my biggest problem with the game right now. There really should be an extra item tier at around 810. Right now it makes leveling to 100 not very appealing.
Especially for amulets and rings where item power only affects resistance values which is not very valuable for now.
I do understand the limit on rerolling stats though, as they obviously prefer you to get new items instead of rerolling existing items repeatedly to get the perfect item.