I can't believe nobody else addressed this, so I will. Ace Combat 5 is an amazing game. It got 8.3 from GS and 9.3 from IGN. I totally disagree with GS's score, it should be given at least a 9. This is my only Ace Combat game, so maybe I'm a little biased towards this game, but, I paid $49.99 for it and I'm quite satisfied with my purchase (I pre-ordered to get a couple of bonuses, so yeah, go ahead and call me a dork or stupid if you want). It has over 50 real life Aircraft and a couple of ones you wish were real. The games graphics are amazing, I couldn't believe how good my replays looked (you can't save them though).
Ace Combat 5 has a Puddle of Mudd song in part of the intro, so add or subtract points if you'd like. It has cinemas and a interesting story, I don't know if it's good or great because I'm not a very good judge of that sort of thing, so I dunno. The characters might seem a bit whiny when it comes to the anti-war stance they have (there isn't a blood thirsty destroy everything character), but a few service people I know would rather not go to war unless they absolutely had to. You can give commands to your wingman and answer yes or no to questions which will effect which missions you play. It sounds and looks great, and it plays damn well too. The missile trails look great and some of the music seems to fit some of the missions really well. There was only one stage bgm that I didn't particularly care for, but it didn't sound bad, it just didn't appeal to me.
There is a couple of stupid glitches like the computer flying underwater or into and under the ground, but that doesn't happen very often and shouldn't effect 99.99% of the gameplay (although that .01% is kinda annoying when the computer does a maneuver you wish you could do too...)
It has several levels of difficulty to accommodate players of all skill levels. You can shoot down other ace pilots or whatever they're called to unlock different paint schemes. It doesn't have online or multiplayer, but multiplayer in Ace Combat 4 felt gimmicky too some of the people I talked to, and it doesn't make up for everything else it lacks compared to 5.
With 30+ missions and an Arcade mode, IMO, this is one of the best games of the year (top 10 probably). If you can get over the fact that the planes in this game are carrying 60+ missiles, you'll have a lot of fun blowing stuff up and dog-fighting. If you demand that your games have airplanes that can only carry 4-8 missiles, this game isn't for you (on higher levels they limit your machine guns to 800 rounds of ammo, but that's for Ace level and I've never played on Hard or Extreme so...). If I didn't pre-order it, I probably would have paid $30-$40 for it, so $5 is quite a steal.