Yes it does get better. One of the best Suikoden OSTs, especially in terms of sound quality.
Though I recommend Suiko I, II and V above anything and everything.
I've gotten all of the Suikoden arrange albums, if I want music from the first two Suikodens;
otherwise I'm not too receptive of music for which I haven't even played the game, and probably will never have the chance,
but I'll vouch for Suikoden V's soundtrack: definitely my favorite, just given the professionalism of the audio quality.
Suikoden IV is nice and relaxing, but wouldn't have made an impression on me had I not played the game.
Suikoden Tactics / Rhapsodia seems to be wrapping nicely on all fronts of gameplay, music, and plot. It's definitely keeping me going easily.
Think Final Fantasy Tactics, but not as obscenely difficult.