Is the PSP worth it?

[Frozengale]

The Prinny Games are reason enough to get one in my opinion.
Echochrome is really amazing
Lumines
Coded Arms was fairly interesting
Loco Roco 1 and 2

And the Mega Man Reboots (Powered Up, and Maverick Hunter X) were amazing. There is nothing quite as fun as playing as Vile in Maverick Hunter X.

 

[Atmos Duality]

No, it really isn't.
I own one; I haven't charged it in 4 months, and that was only to listen to music remotely while my MP3 player wasn't available.
That's my bias speaking I admit, but seriously, the control scheme was enough to turn me away and there isn't any games coming out that I really care about.

 

[Logic 0]

A few good ones are

Dissidia

Dissidia:doudecium

kingdom hearts: birth by sleeep

crisis core final fantasy 7

final fantasy tatics: WOTL

GOW chains of olympus

castlevania: the dracula X chronicles.