A game that's already been out for years.

That's probably one of the biggest issues with the PSP, most of its 'good' games are games that you may have already played to death on one of its older brothers. Some of the ports don't even work all that well because there isn't a 2nd analog nub. If you were to get a list of the best games you can get for the PSP right now, 80% of them you could probably find the exact same game (or something similar to it) on a different system. Tekken, Guilty Gear, Burnout, Mega Man, Valkyrie Profile... heck, even Lumines is coming out for PS2 and 360. There are a few stand-out original games: like Exit, LocoRoco and Daxter, but currently they're too few and far between.

If the only thing you like about the PSP is the UMD movies, then you're in it for the wrong reasons. The UMD format has pretty much failed for anything outside of games, and it seems only Sony themselves is still supporting it for their own movies.

However, if you don't really intend to get a lot of games for it, the homebrew scene for the PSP is pretty awesome. Most of the homebrew applicatons can only run on a certain firmware version, and most of the newer PSP games require you to upgrade past that version in order to play them, so it's a bit of a trade-off depending how deep into the 'hax you want to go.

If you just want a game system with tons of great games that are usually unique and fresh, then the DS is the way to go. Plus the battery life is way longer.