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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I like how it was actually worth the money. CEA was treated like a side project. ODST however was treated like a full game. Side story doesn't necessarily mean side project. Anyways, ODST, the game with the least amount of glitches. It felt very polished. The only reasonable complaint is no skull hunting.