I enjoyed Armageddon too!! Of the campaign, the first third is played underground, and begins to feel very repetitive. Suddenly, the game changes, and the remaining two thirds are great!! I think the campaign is let-down a little by the fact that the
creators of the game wanted to keep the story as consistent as possible, letting the 'big bangs' happen later.
Of the multiplayer, the two modes available are great fun I think!! Extras are cool too!!
As an extra, I bought the DLC campaign add-on - although its short, its very sweet, and if you play it in tandem with the main campaign, it makes the game flow a little better.
It's a shame they've given up on the RF series due to lack of sales. Red Faction Guerrilla was such a fun game, and the geomod tech worked perfectly. I remember playing Red Faction on PS2 which was amazing for its time.
Hopefully they'll bring it back in a few years, just like they brought back the series with RFG.