Pretty decent installment. Not a big fan of the art style, and the BGs are lame, but I like the character roster on this one. My KOF2k1 team = Vanessa, K9999, and Angel. The controls for this one are definitely better than 2000 on the DC.
I didn't really like the whole ratio-type thing that much, it felt like they were just ripping of Capcom vs SNK - and the system didn't work very well in that game (although it was improved in KOF, definitely).
And Berty, Eolith was also responsible for 2k2.