Crystal Chronicles was an *amazing* idea with poor design, if I had to say anything about it. Plus, the plots for the DS game were just weird and sad. The interface with the GBA was just more trouble than it was worth.
I oddly did like Chrystal Bearers for whatever-the-fuck reason. Maybe it was the opening theme the just set a good idea. I dunno.
The sad part was that it had potential if it didn't use that silly GBA-GCN connection gimmick since the game didn't really make good use of it. A Co-op ARPG in the vein of Secret of Mana would've been a godsend back in those days, especially with the more simplified mechanics and interface versus the "I spam my stack of numbers' cheezy option against the game's stack of numbers because every other way is too slow and tedious and I liek BEEG NUMBURS :).".