I've played this game with every character, and I can say that it's one of my favorite RPGs on the SNES. It's a giant step up from Secret of Mana, and still holds up well to this day. The class and combat system is fun, and having a lot of variety is a nice decision. The story isn't something you'd find in other SNES RPGs such as Live-A-Live or FF6, but it's still decent at best. After all, this is a Mana game. The music and sprites are probably the best there is on the system, and man are they beautiful. Unfortunately, the game suffers from some severe balancing issues (looking at you, Hawkeye and Kevin) and combat can get tiring, but it isn't a huge deal. Some people will say that you should play the remake, Tr(w)ials of Mana over this, but you really shouldn't. I'd say that both are worth a playthrough, especially if you played the remake first. Otherwise, SD3 is a must play if you're a fan of SNES RPGs.
tl;dr: game good