There's problems with the 3DS when it comes to DS games
for example the inputs register less at least for certain games. I played a DS chrono trigger cart on my 3DS and I could never win the drinking minigame (which requires as fast as possible button mashing) no matter how hard I tried; I pop it into my DS and I win first or second try
Play Mystery Dungeon Explorers of Darkness, Time or Sky; they're all basically the same thing afaik; I played Darkness.
Days of Ruin is best Advance Wars, Dual Strike is shit
Don't bother with DS FE, GBA and SNES ones are far better
No idea about metroid prime hunters but its probably shit