No you do not have to have halo3 to get halo3 odst.I have heard a few bad reviews of it but most are good so i suggest people should get it.
halo3 odst is an expansion of halo3 the only big difference is that you no longer play as a Spartan you play as an odst.
halo 3 odst
personally i like halo 3 better then all of halos so far. halo 3 is better because you are able to play agenset people on xbox live but halo odst is better in the sence that the story line makes more sence then all other halos.
in my opinion halo 3odst
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In Halo 3, you play as the Master Chief, the last surviving super-soldier of the Spartan II group. In Halo 3: ODST, you play as an ODST instead of the Master Chief. There are also different weapons in ODST.
To get the recon armor you have to complete all the vidmaster achievements in halo3 and halo3 odst.
It's the same as halo 3 (:
halo,halo 2,halo 3,halo3 ODST,halo wars,halo reach
Yes halo 3 ODST does have swearing in it but the swearing isn't that bad meaning the characters in ODST don't swear that much.
Halo 3:ODST (Orbital Drop Shock Trooper) comes out September 22, this year (2009)
Yes, but only on co-op there is no vs. mode, however the Halo 3 ODST case includes 2 discs one including Halo3 ODST and the other being the complete Halo 3 multi-player experience.