Sorry if the text is a bit confusing, wrote it and scrapped it 2 times, and now I just wanna get over it quickly :I
After a few playtimes I've noticed the game almost always takes most time fighting CP2-CP3, without CP3 changing owners too often. The problem might partly be that the people at CP2 always have 2-3 engineers, making it hard to penetrate the defense, where as CP3 people maybe just have one, and still can keep the CP just fine.
At CP2 there is a decent amount of metal around, combined with the leading team rushing in mostly from below 'cause due to it being the shortest route, getting killed, and giving even more metal to the engineers. Once the leading team figures out to use the upper path, and maybe even uber, the other team gets wiped out and falls back to CP1. In other words, just like Fastlane, its easy to set up at CP2, but it fails, making it really annoying.
CP3 is a bit weird. The CP itself is below the main way for the enemy, due to them spawning at the path that leads up to the bridge. The capturers need to face probably 2 or 3 waves at least, which of most come from above, plus the additional people coming back from behind to secure the CP. The people at CP3 don't even need an engineer to build up there due to the big adventage they have.
To the attackers of CP3, there is a choice. They can either go straight to the top, and then have to jump down and lose their only adventage. Or they can go through the lower ways, having a major height disadventage during the entire walk from the bottom to the top of the hill (where they, as previously ranted, still have a height adventage). The last option is turning right before walking outside from the house, and then ending up at a passage to the enemy bridge. Sadly most people dont realise this and due to this the entire map stalls at CP2
Conclusion, less metal at CP2. Change the forward spawn to not lead instantly to the highest route at CP3, or put the CP itself higher up, giving the capturers less disadventage to most of the enemies. Or make it more obvious that there is a way to get to the enemy bridge