awesome game.although the campaign is short, the firefight mode and quality of the campaign make up for it !
the campaign is short and i beat it in 5 hours on normal however the quality of the campaign is amazing so the only dissapointing part is beating it lol.
firefight mode is a new awesome addition to halo games it is where u select a map and you by yourself or with friends on xbox live can see how long you can hold off against covenent forces and each round gets harder and harder for example on the second round catch will be enabled and the grunts (mostly) but also brutes will shower you with grenades. firefight mode can and will blow you away.
another thing is the soundtrack in the game is different to other halo but still maintains the awesomeness feel like the other halo games.
overall odst is definetly a must have weather you love the halo series or are new to it this game is just an awesome fps and 60 bux is cheap for the quality of this game.