Yeah, I'm not saying it's devoid of any of the sort, just that the actual battle scenarios are pretty tightly distributed and controlled. The vehicles do add something to that, but mostly you're lead from one pocket of enemies to the next, a bit like what I've seen of KZ2 so far. Nothing wrong with that at all, but I sometimes feel that people are still referring to the Halo 1 design, despite Halo 3 not having much of that.
I do hope they have something of the Scarab sort in there, a bigger enemy with some choice in how to take it down.