Update: I was unfortunately not aware of Shamus Young's severe criticism of Fallout 3 available here to link in the original piece and I regret that. It dovetails rather nicely with what I've written and it's much better executed than my piece. I strongly recommend anyone...
The Good: Decent humor, fast action, cool sniper rifle
The Bad: Hideous graphics, horrible jumping sequences, no voices?
This is yet another great game by renowned developer Tim Schaffer who is known for games such as Wild 9, Earth Worm Jim, and Psychonauts. This game has a great dose of humor with things like "The world's smallest nuclear explosion"...it's ingenious! Tim always has the humor in the gameplay and not just with dialog and videos. The story is almost non existent (as were most of Tim Schaffer's older games) you play a guy with a pointy armor nose and you take it off for a gun and you put it on for a sniper rifle. You have three "windows" on your rifle to see where your bullets are going. This is good for lobbing mortars into tubes to kill protecting enemies etc. While the action is fast paced there are a lot of problems. The jumping sequences are terrible thanks to the character moving way too fast. The graphics are hideous even for the PS1. Everything looks flat, brown, and boring. There are also no voices at all. If you can stomach all this you can pick it up fairly cheap (it's not one of those ULTRA rare $100 eBay games).