The PSP was cool regardless of not that many games interesting me, (there are more that do now though) because it was if you will forgive the comparison- like an IRL PET. you could do everything on that [parasitic bomb], music, internet, games...
PU doesnt exactly interest me THAT much TBH, I never liked the overly chibi look it has- i always felt it was TOO cute. Even for classic. And I dislike Rock's voice. I curious though, and the level builder looks fairly interesting enough to amuse me. As well as Playble Robot masters. I mean really. Thunder beam as my main weapon? Yes please.
MHX is similar. Except it DOES excite me.(Unlike PU) i like it's intention, despite not being a perfect remake. I like the updated graphics and stuff, the VAs, stuff like that- I never liked the way they swapped capsules around though- and well, yeah vile mode sounds interesting, though i still would have liked a Zero mode- JUST for the sake of seeing how pre-X2 Zero functions in a playable manner.
And of course Day of Sigma, but i can find that online, so no biggie there.\
Still, the DS had that simulated surround sound shpiel, though I can't remember any games that used it other than SM64DS.
in any case it made sound sound much better in any game. Dawn of Sorrow sounded surround... (which made Bloody tears sound all the more awesome) but maybe thats just me.