Let\'s see, now, as I did say I would have picked RF, TTT, and Dark Cloud... but Out of ZoE, Onimusha, and Starfighter I can go into some description...
I beat all of them, rented Onimusha, owned Starfighter for 2 weeks, and still own ZoE (for the MGS2 demo).
All 3 games have the same basic mid-early-1st-gen PS2 game problem of being way too short... We\'re talking less than 10 hours of gameplay here most likley.
ZoE is by far the shortest, but has the best graphics, it is also the simplest... The storyline is annoying, which hurts the funness of replaying the game and watching all the cinemas, mostly because it\'s such a trip about morals. The MGS2 demo has probably given me 10 hours of gameplay on it\'s own by now though and will probably give me another 10-20 by the time the game comes out too.... I was stunned how much fun it is to screw around in. (stuff like forcing an enemy to shoot a bullet hole in your box outdoors so their lightes shine in)...
Starfighter is a good shooter, just not great, but it ends way too quick for it\'s level of replay... Also, to earn the secrets (the later ones which I unlocked with a code), can be extremely hard, but not really fun. Graphics pretty darn good...
Onimusha is like Resident Evil but all action and longer, I didn\'t find it as cool as RE: CV for Dreamcast... Graphics are good, but it\'s mostly prerendered backgrounds, and for a game with prerendered backgrounds, the character models aren\'t as good as they should be (IMO). This game was also very very short, and had zero replay for me, so I never bothered to buy it...
Hope this helps... (buy Tekken if you like fighters and/or Dark Cloud if you like dungeon crawlers (great games)).