At least in the early game. Late game it feels like you can replenish losses quickly, but early on, it is very easy to lose your whole army. You are then at 100 req, and you literally just sit there twiddling your thumbs watching the req bar go up until you can build your forces again.
Of course often your enemy is fairly injured as well, and afraid to push his luck, so he doesnt press his advantage. What seems to happen is a big lull in the action where no one does anything.
I think req generation should be higher earlier,
There should be a retreat button (that exists only in phase one)