I don't understand how anyone could be disappointed with the PSP lineup for the next few months. Personally, I'm very excited about upcoming releases like Daxter, Burnout Legends, Lemmings, Namco Museum Battle Collection, Midway Arcade Treasures, Street Fighter Alpha 3, and Grand Theft Auto: Liberty City Stories, and I will almost surely get all of these unless something nasty comes up during their development to steer me away from them.
There are lots of other promising new titles, too--SOCOM: Fireteam Bravo, Virtua Tennis, Death Jr., GripShift, Frantix, Stacked, MediEvil Resurrection, Pursuit Force, Advent Shadow, The Con, The Sims 2, Mortal Kombat: Deception, Infected, lots of EA Sports games...this is an absolutely killer lineup of (seemingly) high-quality games for a handheld, with a good mix of conversions and all-new originals. I certainly couldn't afford to get all of these games!
If I only got 5 or 6 really good PSP games for the rest of the year (about the rate I was buying games for GBA during the first 2 years), then I'd still be satisfied. If I could get 10 more good PSP games for the rest of the year, then I would be overjoyed. The only disappointments for me (so far) are no sign of Gran Turismo 4 Mobile (which leads me to believe it's nowhere near ready for release), and I was hoping Atari or Activision would offer up classic game compilation packs for PSP. Otherwise, there's a lot to love regarding the PSP.