The PSP was designed to be "cool". What cool games are there? The coolest, to most, are SotN, FF7, Silent Hill, RE2, etc. All available, soon, on the PSP... and the PS1 coincedently.
The best thing is we get to experience all these games with no loading screens! The only thing that made them atrochious in the first place, btw. Memory Stick FTW!