I used to love Digimon. Played most of the games, and of them all, I'd say Digimon World 3 was the best. 1 was a 3D tamagotchi pet, 2 was a half-assed dungeon crawler, and 4 was... lets just say it was bad. At least 3 tried to have a story (and one that wasn't too bad, if a little predictable), and except for the ridiculous requirements for unlocking advanced forms, was fairly well balanced.
As far as the anime, Seasons 1 and 2 were great. Season 3 was ok, it took an interesting spin on the world established at the end of season 2. Season 4 (what is it with Digimons and 4's?) was terrible. Nice premise (humans turning into Digimons), but it really had nothing to do with the franchise except as an excuse to reuse characters (and they didn't even do that, really). I never saw season 5, but I saw the game based on it (Data Squad, something), it looked interesting, but not particularly so.
As far as my own partner, It has and always will be my buddy Kotemon.
He's an awesome little dude, and his bladed evolutions are equally awesome (not to scale).