I thought the PSP Tekken was actually the best; I played the older ones on the PS2 Tekken 5 release, and I thought they all moved too slow for my liking (strangely, so did Tekken 5, but maybe I didn't give it enough time). I still think the series is better than Virtua Fighter (too floaty, and I'm still bitter that my VF4: Evo doesn't have rumble!), though about equal with Dead or Alive and outclassed by Soul Calibur (III's the tops for me, though I loves me some II Link every once in awhile). And I don't think 2D fighters are comparable; totally different creature.
Nevertheless, I'm not getting this for awhile as there's no way I'm blowing my money on a PS3 until it's at a garage sale for $200.