According to Stephen Toulouse, Microsoft’s Director of Policy and Enforcement of XBOX Live, Halo 3: ODST is optimized for HDD install for faster and smoother gameplay. It is no doubt that we can experience glitches along the way and maybe by installing the game on the HDD will fix these. This is also a good way to prevent disc read errors that some users are experiencing as they play Halo 3: ODST.
I never experienced any disc read errors so far and as far as glitches, it’s there. Maybe I need to install the game now… Are you?