Love this game - still replay it probably once a year. A full run of all sidequests and weapons takes me like 10 hours, so it's short, but it's still a lot of fun.
The graphics are very stylized, leading to a very cartoonly look, but coupled with the colors and the overall light tone of the game, it works well. The controls can feel a bit goofy, but I always start a run by going into the menu and changing the turn/rotate controls, and by the end of the tutorial dungeon ( MEGAMAN! MEGAMAN!), it all feels fine. The music and overall ambiance created by sound between the town and the ruins is very nice. There are a good number of hidden events and items to find, the characters are fun, and the voiceacting is pretty solid.
2 really spreads out, since 1 takes place only on one island, and 2 is more of a race-around-the-world kinda thing, and it loses the feeling of actually getting to know everyone in town and having a place you really want to help out. The minigames in 2 are really obnoxious to deal with, and there are some events that annoy the living hell out of me (rescue quest for the girl with the two retarded brothers and the ENTIRE underwater ruin), but some functions were improved, like easier zenny collecting. Misadventures of Tron Bonne is a prequal, and is made up of a variety of different games/puzzles, which can be interesting. It still includes a lot of action gameplay just like the previous titles, though.
tl;dr - Give the first one a shot for sure. If you like it, try the others.