Finally, the DS gets a good fighter!
For starters, the character roster is large and diverse. Not a Bleach fan myself, but I was taken aback by the wide range of characters and their respective move sets. For a handheld fighting game, BDS roster is staggering.
Many of the special attacks can be executed "Capcom fighter" style via half-circle/quarter-circle movements. The ability to switch-up the various "cards" for enhanced abilities, damage, damage reduction, dodging is a big plus.
The graphics are colorful, detailed and gorgeous. It completely captures its Anime inspired feel. And the decision to go 2D was a smart one, it keeps things deceptively simple.
If you're itching for a fight and own a DS, I highly recommend Bleach Dark Souls.