It's almost as if Halo 3: ODST would ultimately prefer you to just stand up and fight everyone. And when you do, while it slows the game down somewhat, at least things are back to the familiarly brilliant first-person combat Halo is so good at.
What does work well from the stealth side of things is the new night-vision visor: it not only boosts light levels, but also beautifully picks out switches, enemies and other interactive elements.
And ODST's single-player campaign sees plenty of classic Halo action. But as a stealth game? Or for a sense of where the Halo franchise goes next? ODST is running on empty.