This game is underrated, It's one of the best that the dreamcast has to offer!
The singleplayer experience features an ample storyline with many unlockables as you progress through the levels. As you collect tolkens and babies you can advance to harder levels unlocking more characters, upgrades, and weapons...Each level has it's style and creativeness which also contain more features to come back to time and time again in order to rescue all the babies as you will unlock more characters with special abilities. The Mulitplayer Experience is also very well done featuring deathmatches with up to 4 players. It's fun pwning your friends! :D Another cool thing about the dreamcast version is the ability to use your controllers UMV to exclusively know your info such as health or ammo.
This game has been ripped on for being a third person shooter with too much FPS element. But I disagree, I'd say it's a revolutionary 3rd person shooter. It offers great, fun gameplay. I would love to see a sequel!
This game will last you a long time! It has many levels, featuring many rescues that require the use of all the characters unique abilities. It also features minigames and upgrades on weapons. I'd get it if you can find it, dreamcast games are very cheap but hard to find these days.