A book that likely can be judged by its cover.
The game has two main campaign modes. The Official mode follows the story of the anime series. There are characters from the original Mobile Suit Gundam, Zeta Gundam, and Double Zeta series. For people who aren't familiar with specific characters this does a decent job of introducing them while providing some challenging missions. The other campaign mode, Original more, has a new story and includes all the characters from official mode and adds more characters from Gundam Wing and G Gundam series. The story is centered around an asteroid falling into earth, but despite the effort the story really doesn't matter. While these missions can create a lot of interesting mash ups for fans, people who are unfamiliar with Gundam will probably miss the significance. The stages are still fun and there are a lot of them, but with the repetitive nature of the game, most players will get bored before completing all the missions.
There are some options for 2 players. Any campaign can be player through with two people. There is also a VS mode for some competitive local multiplayer. The co-op campaign adds a lot of fun, but the camera can take a couple minutes to get used to. The Vs mode is probably going to be ignored by most people, but its actually a lot of fun too.
The gameplay is pretty simple. Most of the action centers around killing tons of enemies using simple button combos. Each stage has fields you must capture and usually several Bosses. As you progress you will gain experience for your pilot and your Mobile Suit. You will also gain parts and skills that you can use to customize your characters' abilities. These are most useful when someone is playing a 2nd player. In single player, by time you have power up your character considerably, you're already at the end of their missions.
Visually the game does alright. It has a steady framerate even with the screen packed with enemies and two people playing. Some of the backgrounds seem bland, but the Mobile Suits all look good and their attacks are all animated well. The cut-scenes are passable, but not astounding.
Audio in the game is about the same. The soundtrack is not particularly notable, but they're not distracting either. Most of the voice acting is true to the English voices on the anime. The dialog I found to be enjoyable, but sometimes the characters can get annoying in battle as they will say the same three sentences over and over.
What it comes down to is a game that is fun to play and more fun if you're a Gundam fan. In fact if you really enjoy the characters I would recommend just buying this game. There is about 50 hours of gameplay to be had. If you're not a Gundam fan you might only make it through 10 hours of that before getting bored. Still it makes a nice rent and is easpecially fun to work through with a friend. Even with its flaws I really like the game.