Complaints levelled against FFI DoS:
Difficulty toned down too far
Save anywhere makes the already easy game a breeze
Ship mini game gives too much gil
MP system is too powerful
Too many super powerful items in Soul of Chaos dungeons
Thief can't run as well

Complaints levelled against FFII DoS:
New inventory system makes game too easy (99 elixirs)
Item use is too powerful
Soul of Rebirth makes no sense
"FFII has teh s uck"

Complaints levelled against FFIII DS:
It's for the DS, and "DS is ghey"

Complaints levelled against FFIV Advance:
Kain's jump, Yang's Power and the Twin command were nerfed (fixed in European release)
Difficulty toned down too much
Fun bugs that erase all saved data (fixed in Euro version)
Double turn glitch (fixed in Euro version)
Berserk doesn't function properly (fixed in Euro version)
Miss Vamp (and her pallete swaps) hover below the top of the screen
long range weapons are nerfed

These are the most recent remakes and therefore the "sexiest".