In hindsight, overall, the SP challenges were pretty lame. I think they need a bit more "substance". WTF is with those infinate-spawing rebels?
It's something to add to BF3, more variety in missions and more missions that don't involve you running to a command post. I'd live to see more "using the strenghts of particular classes" kind of things. I'd love to have to wreck bridges as an engineer, to halt rebel movements, then switch to a sniper to stop rebels using theirs to stop the other engineer teams getting taken out...
I am the definition of your defeat.