Back when the Neo-Geo Pocket Color was still around, I heard nothing but positive things about the original from my NGPC-owning friends.
Well, most of the people who liked the original don't seem to be liking this one that much. Personally, I don't think it's all that bad, but there are some things I've been disappointed about.
-The "Force" thing. It's like mana in Magic the Gathering and stuff. I thought the old one was cool because you didn't really have to deal with any kind of cost system to bring characters out. It makes the game play a lot slower than the original one.
-You can't move around like in an RPG anymore. Instead, you just select locations to move your character to. One of my favorite things about the original one was how you could explore places and find secrets (like the secret room in Resident Evil Mansion).
-The back-up/support system is different. In the original, it was cool because you could use related character cards as "back-ups" that increased the BP of your cards. There is a similar thing in the new one, but it's just not as cool. You just back-up cards of the same trait or something (like "yellow" characters with other "yellow" characters I think). In the original, I liked it because the back-up characters were always related in some way. Like Eiji and Zantetsu could back up each other because they were from the same ninja clan and stuff. You also had to experiment to find them all out (because some had question marks listed as back-up that would fill in after you figured it out). Like, SNK's Lee Pai Long could be backed up by Capcom's Vega/Balrog because they both wore claws. I just thought it was a cool extra touch for the fans. It seems that a lot of the small things like that are gone in the new one (when deciding who goes first, it just shows dice rolling animation - in the orginal it showed the Ump from Samurai Shodown point his flag to whoever goes first).
I do like the selection of cards in the new one though. There's a lot of characters that I'm glad got cards.
Of course, the glitch is still the main complaint I have.