Other than the fact that I'm a diehard Halo fan, one of the main driving reasons of buying this game is because of the this trailer: http://www.youtube.com/watch?v=IklqPx3unjs
I really really love the ODST's, and if I could join ANY military in ANY setting or time, I would have joined the ODST's if such a military force exists during my existence.
Anyway, the trailer made me thought that I would experience epic battles as an ODST who jumps straight into the battlefield in an HEV, and as soon as the door opens, there will be intense fighting, just like the trailer.
My favorite part about ODST was the very first scene where you're up in Earth's orbit, and in first person you drop onto Earth. That was an cool experience, and if there's an ODST 2, I PRAY and BEG that 343 makes it possible for us to pilot our HEV's a bit and fight in long term campaigns in open ended settings.
Thank you thank you Bungie for making such an awesome game, but I wish the future will be even greater.