The only gripe i have is kind of a 2 parter. The randomness of stats + the inability to change the stats on Uniques.
Getting a 4 stat rare thats fot 3 of what i want and then something uselessness and then spending MILLIONS of gold and dozens of mats to TRY and get that 4th mod to be useful is pain.
Getting an ancestral unique that has great damage and 2 good mods for me while the other 2 are either meh or just 
and thus overall being a downgrade from my current 4 stat imprinted rare is just agony.
Stat allocation/stat rerolling needs a cleanup. And let us mod uniques. Not even extract the powers off them, just mod the stats.