LOVING this game now!
They aren't kidding about the small elite hero squad or massive army. The mechanics are really changed around, and I didn't know what to think of it at first. When you opt to not take a hero into a mission, you're able to requisition more squads into the mission. For example, the last mission I did, the only hero I took was my space marine captain, because he is a requirement. The other 3 I chose their alternates. I was marching across the map with 4 terminator squads (One squad upgraded to lightning claws), and two dreadnaughts (One dread upgraded to autocanon), and a devastator squad (upgraded to las canon) and my hero. They were death incarnate. I have never had so much FUN.
You really don't get to see the plus side of the new mechanics until about 4-5 missions in. (~3 hrs or so?)
LOVE IT. Can't wait to play all the single player campaigns. You can get some massive sized armies going depending what troops you requisition. Terminators are sort of expensive, but if I went for normal Tact space marine squads I could have had maybe eight of those compared to the four terminator squads? Amazing.
One issue is that it only seems to show up to 9 squads. When you have 12 or more, you really don't see any icons or anything for them. So I'm not sure how to select them or get to them.