Yeah, like I said, I tried it briefly. Would definitely be easier with more people, it just didn't interest me enough to bother enticing someone else to play it.
Like Aegis wing, for example, you can face hordes of enemies and bullets and still dodge, and they don't have the same firepower as you. You can also prevent them from getting in close, where you can't dodge them easily, by shooting at them beforehand. The ranges and firepower are equal in single player campaign, but there are more enemies than there are me. Whatever my computer controlled teammates are supposed to do, they don't do it very well, it's rare that I saw more than 1 other blue colored character at a time.