Well, aside from random character listings, I have indeed played Final Fantasy prior to Cloud in Smash. Here's my thoughts on the main numbered titles
FF1 - I haven't played much into this, but from what I played and can remember, it was alright. This is judging from the PSP version.
FF2 - Same platform and thoughts on this game as FF2.
FF3 - It may have a more expanded amount of jobs than FF1, but judging from the DS port, don't want to finish it through.
FF4 - haven't finished any version I played, but it was enjoyable. I might restart a playthrough on that one.
FF5 - Currently on a playthrough (juggling that with other games outside of FF) and I am loving it. The Job System in that game is amazing. Got to get back on that game. The mobile/Steam ports graphics are passable. I think this game is my favorite of the franchise.
FF6 - Good game, I never finished my Virtual Console run, though. Definitely a good entry in the series.
FF7 - Beat this game. I like the game, just not too strongly. The game does deserve some the attention it gets.
FF8 - Beat this one and it was my first FF title. I can definitely say that the soundtrack is amazing. People have mixed opinions in general, but I liked it.
FF9 - This is a good game. Like 8, good soundtrack.
FF10 - I think it's okay, I don't have real strong opinions on this.
FF12 - I have to go back to this one for an opinion.
FF13 - It doesn't interest me any more. Lightning is the only one who stands out due to advertising.
Never played the FF11 and FF14 (Original or reboot) games because they're MMOs. I don't have an opinion on them.
F15 - I played demos of this game. It looks promising. If I get it, I'll say on how it is.