Mario and Luigi - PoT

Sonic Advance 1-3

DK: King of Swing

Fire Emblem: Sacred Stones

Advance Wars

FF Tactics Advance

Fire Emblem: Sacred Stones

Sword of Mana was a solid game, it was just confusing at times.

Kingdom Hearts Chain of Memories

1) Earthbound/Mother - new title, ported title, any title will do!

2) More turn-based RTS games like Advance Wars and Age of Kings

3) A 3-D version of FF VI

4) Super Mario RPG DS

5) The Shonen Jump All-Stars game (except in English)

Absolute worst: World Series of Poker for DS

Paid $5 for it thinking "how can you mess up a poker game?" only to find this game horribly broken in all conceivable ways.

Graphics were worse than any GBC game, the rounds took about 5 minutes for each player to play their cards, and every oppenent (all five of them) had a horrendesly annoying phrase they would say everytime they played their cards.

Runner-Up

Lunar Dragon Song

Sadly this game is the black sheep of the franchise. Most of the quests are repetivie fetch quests (go bring me 5 iron, 8 acorns, and 12 tree bark) which is bad in two ways. 1) The drop rate for quest items is horrendous, only about 1/15 enemies will drop a needed item. 2) You have to choose between items and exp, you can't get both in the same battle. The battle rounds take too long and your charachters die ... A LOT.