Definitely the most underrated Halo game ever. I just beat ODST on legendary, not only to get a whopping 300 GS, but also to revisit the game. I have to say, I haven't had that much fun in a video game in quite a while. The story was just so great, and the characters really made playing the game an awesome experience.
ITT: Post what you love about Halo 3 ODST
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ODST doesn't have the best story or gameplay from the Halo series, but it still has some something that makes it the best. The entire sense of mystery you get in New Mombassa from the Covenant glyphs, and exploring the city both made the game great. It's a pity it's so underrated.