Okay, without slavery America wouldn't become a world global force. So slavery doesn't suck, right?
FFs 1-3 had stupid battle system and menu system, sorry. Though, there are several releases which change graphics into better and most bugs (for wonderswan, for example)...
Chrono Trigger is cool, too, except the thing I suck in it, time travel*.
* I won't give stupid examples like getting back into past and killing your mother (you have no right to exist this way).
I'll give a short question, instead, let's say you travel into middle-ages, on some day, on hour 14.03. local time. Do you also exist there on 14.04 local time? (most will answer, yes).
Also, let's say you get somewhere on hour 14.02 and take a person with you. Then you get back on hour 14.01 and take the same person. Soon you'll get an army of clones.
The same is present in Chrono Trigger, when you put Robo into work, then return into future and take him back (Fiona's forest quest). You can get back into past and see Robo is still working, through it's with you!