3mil units? Not a chance. More like 1, maybe.
It's an enjoyable game, and I'll get it to learn a bit about the battles pre-Halo, but if it wasn't Halo-branded, I'd probably skip it.
Controls are interesting, I'd never played an RTS on console before this one. Left stick moves the camera, right stick zooms. "A" is select, "X" is action, hold "A" and you get a selection circle (no drawing your own), double-tap "A" on a unit selects all of that unit type. "X" is, as mentioned, action, so you use "X" to attack, move, garrison, etc. when you have units selected.
Base building is pretty simplified. You have a station with pads around it, and you select structures from the pads. Barracks, resource, vehicles, power. Resources are simplified and sent in automatically by your ship from orbit, or can be collected on the field. There's a unit cap, of course.
Combat is simplified. Click "X" on an enemy unit and your unit attacks it. "Y" is special attack (like ramming for Warthogs, that's always fun). Units can be upgraded (Warthogs get a grenadier, Marines get rockets for their special attack), buildings too.
It's all pretty seamless and intuitive, IMO. Despite everything being streamlined, it still feels "right". I just wish you could zoom in closer.
Oh, and the new AI is better looking than Cortana 😛