My tank sucks. But my alien hover craft is alright.
Anyway, having said that...I never got the chance to play the Online part. I got this game at the end of an era. An era where Sega finally killed themselves with poor marketing, a lack of core games, and a general disdain for comfortable controllers. So all the Sega servers were either shipped away to live with foster parents, or burned alive in the driveway. At any rate, I never had the opportunity to fight with other real life kids. So instead I fought against the fake life computer.
And it's a pretty decent fight. The game is showing it's age now, but back then the thing was slick. The graphics were cool and the action was pretty intense. You can fight as either the army or the aliens...If you like humans, the planet Earth, and apple pie, you'll play as the army. If you like purple, Michael McDonald, and global warming, you'll play as the aliens. Either way, you get to try to blow up the other team in a series of scenarios. Which isn't as easy as it sounds.
The missions are hard. In fact, some missions are so hard that you will be blown to smithereens before you even have a chance to realize what you're supposed to do. It's kind of like waking up in the morning to a gun pointed at your head...and before you have a chance to say "good morning honey", the trigger is pulled and your dead. Which can be frustrating...trust me.
So even though there are some frustrating elements, the game still can be a lot of fun in different areas. Sneaking around and shooting an alien machine in the back is cool. Having an all out war with your buddies in your attack force supporting you is neat. And just seeing the Aliens taking over everything is a pretty nice visual.
So even though the "online" part of the game is irrelevant, the game is pretty good for a "pick-up and put-down" kind of game. If for some reason you own an old Dreamcast still (maybe you own it just to spite your spouse, or just because you're a pack rat and can't throw anything away...including that old happy meal box you got when you were 5, and it smells like rotting bovine carcass and is decaying in front of your eyes...but you keep holding onto it because you have a serious mental illness, but won't admit it out loud to anybody...so you spend your days as a loner...knowing you have this horrible condition that nobody can know about...because nobody will understand...and you'll die alone with your junk...alone and bizarre....), then I suggest picking up this game if you can find it at some pack rat's yard sale that their family member made them have because they were sick of stepping over all the old dreamcast games to use the toilet.