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Elessar Yeah Halo is indeed very Linear. It's not a badly built world but you are right about the militarism. It's like Starship Troopers but without the irony. The bad guys are called the Covenant (an English term used for an organisation of witches.) Obviously, they had to have Tyranid/Zerg/ Alien ripoff and called it the Flood. You know because they don't have enough biblical references after calling the game Halo.
As pure shooter, the series is first class though. I did play the campaigns but skipped through the narrative scenes because they were pointless.
Rescue this artefact, neutralise this threat blah blah. Dude, I just want to drive a Jeep up a ramp and onto a giant Robot beetle, jump out and shoot some bad guys.