The only downside is that your whole party is mute, and only your main char is in "cutscenes" (that's only for DQ IX), although there are some side characters that appear to do all the talking. But yeah, you start off as a Ministrel, but after you advance the story enough you can change vocation, and later even unlock a few new vocations, all classes have 2 specific quests too for their respective armor and ultimate skill :D
I played Final Fantasy Tactics for the GBA, loved that game, still gotta play the DS and psx ones.
I used to have 4GB too but 2 stopped working, so I only really have 1GB for the game and the other 1GB for the system/windows.