they are the only FFs i lack besides 6, so i figured i would ask.

i'm a huge FF fan and i'd say they are good, some people say Kefka is > than Sephiroth
i on the other hand disagree completely

Hmm Kefka = FF6 no?..

i dunno... i know 6 is suppose to be good, but i haven't heard much on 4 or 5 much, so was just wondering.

i dont really remember 5 but im pretty sure its good
only 2 im missing is 3 and 4 but i dont feel like getting those

Kefka FF3 US, FF6 JAP.

34 suck 5 is ok

They're both playable.
You will probably not like them too much if you already played FFs from VII to XII.

4,5,6, and 11 i haven't played. i have 11, but no credit card so i'm screwed :*(
i have played every other ff besides that. 2 i never got into cus of it's system, 3 i didn't get far into since i owned the game, not the ds, 10 i never did beat, but i'm close. just never sat down to finish it. otherwise the rest i have beaten several times and have almost perf files on most of them.

In that case just play those too, you won't regret it as it will be a part of your FF series playthrough.