I thought this was a really great game. It had pretty good graphics for the PSX, controls were well implemented, the missions were good. It is the complete package. Considering the amount that you'll pay, I'd suggest buying CW:Vengeance instead, however. The game starts you off as a lowly pilot and drags you up to giddying heights, with the skill in which you complete the previous mission dictating your objectives in the next. This give pretty good replay value. The weapons at your disposal are really great as well, however you need to play the latter one to get the electro-magnet.
Summary: A really great game, only superceded on PS by it's sequel.
Graphics: 7 (very well presented for a PSX game)
Sound: 7 (could do with some tweaking, but not bad)
Gameplay: 9 (great controls, great missions)
Longevity: 8 (pretty long, gets really tough, as I previously stated, good replay value)