I think the height advantage attackers get attacking the 5th CP is enough of an imbalance that it shouldn't have to drag on, but the ramp that lets you up plus the 2 possible exits make it so it's not an absolute lost cause.
Really, you have to ask if you'd rather fight it out for 15+ minutes moving back and forth on points 2-4, or have a good solid 5 minute fight around 3 with a few minutes of mop-up, though with the off (but not by much) chance that the team that lost 3 can fight back. People who are fine with both, like myself, don't really care. I think the size of the map gives all the classes a chance to do well, potentially top their team's score. Lots of hiding places for a Spy, which is essential in a 5 point push, but also spaces for snipers to work that aren't so wide open that a Sniper can sit in one spot and completely dominate the map. Soldiers and Demos have their normal mobility, and scouts can flank, but without the weird valley/height issues associated with Badlands.
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