Eh. Conceptually, yes. ODST was a lot more original and had a very interesting style of story progression.. But Reach was a lot more new when it came to sandbox elements, engine and setting. Plus it had the benefit of a full production cycle. That said, some parts of ODST vastly outdo reach, particularly the atmosphere of the game.
Eh, I loved the HUB world.. I found it very easy but fun to navigate, and if I wanted to I could really get lost in it. There were a lot of cool encounters to it, and I liked that a lot of them could be avoided. I would have killed to see ODST get a full production budget and schedule. Still, I would be happy for a second ODST, even if it were set during the battle for Reach in the cities as they fell or something.