There is no momentum. You tend to have 1 flag or 2 to shift the war score. Like on exile, if you want a warscore advantage, you have to hold the +15% hp flag. Even if you do this, you hardly get an advantage. It's such a small advantage that getting catas early is just feeding them, while in conquest or domination if you get catas early, you can get them so early( like 9 minutes) that they are hard to fight.
The lack of bonuses, the lack of ways to improve your war score, REALLY messes it up.
You should have bonuses for each Fortress you have, and you should gain a large amount of warscore, like 2k-3k, for destroyed a fortress before your enemy. (IE if your center fortress is destroyed on cataract, the enemy gets +3k warscore. But if you destroy theirs after yours was already destroyed, you get nothing.. or like just 1k)
Right now, fortress is basically unplayable. I found it fun in beta, but now that I know the in's and outs and different strategies on all the maps and how to win, it's so clear that fortress is very flawed. I don't even want to play the ESL tournament today because of the practicing i've been doing on fortress has lead to just grinding teeth instead of having fun.
