I actually grew bored of the DS. Like 90% of DS games (nearly 100% in regards to JRPG's) were harkening back to the 90's. Its not special when EVERYBODY IS DOING THE SAME THING!!. Generic JRPG after Generic JRPG. The Winds of Nostalgia was the final straw for me. PSP had a smaller library but I find that it has more hidden gems.
EDIT - I swear all DS games had the same presentation for 2D and 3D games.