This game rocks! It's a great continuation of the StarFox 64 game. However, unlike Star Fox 64, there are fewer on-rails missions (i.e you fly the arwing on a preset path). There are 3 aspects to this game: on foot, in a landmaster, or in an arwing. The on foot is extremely fun, although you'll find that the characters move too fast for manuevering in tight spaces. There are TONS of different guns, most of which are insanely powerful. Also you can jump, and roll left and right.
The landmaster is not as fun as the on-foot or Arwing missions, but still, it's useful for anti-aircraft times in multiplayer, or even single player. Instead of that weird machine laser plasma ball thing in Starfox 64, the gun on the Landmaster is a cannon, which suprisingly good against Arwings. It moves pretty slow, which isn't useful in the chaotic, fast-paced multi-player.
At last. The Arwing. This HAS to be the MOST FUN aspect of the game. The Arwing looks a lot better. It still has the twin and then hyper laser upgrades, but one better thing is that you don't have to collect two one-level-up upgrades, but instead you can get a two-level-up upgrade. Very useful in single player and muliplayer. You also ride on the wings of teammates in single player, which happens to be extraordianrily fun.
Single Player doesn't have a very appealing storyline, but it's still fairly well done. Basically, you go around and kill these Aparoids, bug like creatures that can take over machines (except your arwing & landmaster). The missions are pretty simplistic, but still extremely intense, even on Bronze level.
Now Multiplayer is the reason to buy this game. It rivals Halo and Timesplitters. With huge maps and weapons everywhere, the multiplayer is awesome. And that's without the billions of things you can unlock (which I won't tell because they're so awesome ;p). And one of the best things is that you can ride on top of someone's arwing while they're flying it. Or, if it's just 2 vs match, then you can get out of it while it's in the air, and shoot people on the ground. Sadly, there's no capture the flag or other styles; only deathmatch and team deathmatch.
So to end, the graphics of this game are average, obviously an improvement from SF64. The sound is superb. Excellent remixes of previous Sf64 songs bring nonstalgia to veterans of the Sf64 series. Remember, get this game, don't rent it.