My joints are getting old early. It's a bad thing indeed for a gamer/programmer like myself. --Particularly ones that winter in the frozen north.
As for not buying games you haven't rented, you could just buy console games from a Game Stop. If you buy used (which is usually a good deal, even if the manual is lost) you can return the game in within seven days for a full refund, because you don't like it or because it was broken or whatever. Used gamestop titles are my go to for PSP. Naturally, you can't return new games, since they are now pre-owned, but you can sell them back for a decent price, unless they are on disks that have commonly available burners like CD or DVD. They still take UMDs, though.
Squad Command was good while it lasted, but it needed one more level, where I go to fight the Greater Deamon from the endgame cutscene. He was the only bad guy who got any decent buildup and just when I thought I was gonna get to kill him, he went and exploded on me. Lame.
They didn't pull that stunt with Dawn of War. I got to fight all three Greater Demons and then I got to argue with Khorne, God of Blood, who sits on the Skull Throne. Then my dude swore to come back and kill Khorne personally, when it was more convenient, which is big words when you are the size of a dude's smallest tooth. That was an ending.
For PSP titles that get a more hearty recommendation, I'd have to go with Metal Gear Solid: Portable Ops, and Metal Gear Acid^2. They are trippy Konami Games, but they are a lot of fun and they have actual dramatic climaxes. For those with infinite time and similar amounts of patience, Spectral Souls gets a big point, but fellow mortals are warned away. I can recommend Dracula X Cronicles, even though I don't have it, because I love Symphony of the Night madly and have wanted the complete edition for years. That alone might be worth your cash, but the addition of Rondo of Blood (Which numerous Japanese speaking gamers assure me is awesome) in actual English is a deal maker.
--But where am I going to get that kind of money?........