Oh yeah, Digimon World is undoubtedly an awesome game series~ I even like the Digimon World 4/X. Although I had NO IDEA where the basis for that game even remotely came from for a LONG time. xD And when I found out that it was based on a Japanese-only movie/special, I started really loving it.
But for me, my favorite of the Digimon games HAVE to be the fighting games (except All-Stars Rumble, which I only bought to support more Digimon games being released in America. xD). But Rumble Arena 1 and 2 are still some of my favorite games to play. My favorite fighting game that's not Smash Bros. I loved its simplicity. They knew what they were and stuck to it~