Note: This has already been fixed on the release branch. The Germans will be actually playable in the next release candidate.

A couple citizens is enough to hold a tower in enemy territory. Other than that I agree.

As of this version I train my tower guys to elite rank and two of them can hold a building in enemy territory. Edit: I forgot to mention that I was referring to p3; doesn't work like that before.

An enemy already cannot hold a sentry tower in your territory, unless putting hero or champs inside, the tower will decay and return to you. So basically the only way to please you in this case would be to increase building decay. In previous alphas, towers with 5 guys inside almost couldn't ever be captured. But that worked both ways. And it was silly. A garrisoned tower in your territory could not be captured unless a very unreasonable effort was made to do so by your opponent, but if ever he did capture it (for example you forgot to garrison it and enemy took it), you would never get it back unless you ram it down first. Since so much players have a hard time managing to defend their buildings, I would have suggested to do something that increase capture point, instead of capture regeneration. It's very different because increasing capture point is only slowing the capturing of buildings, while capture regeneration have a exponential effect that leads into buildings being not capturable. Here are some ideas as a middle ground: Sentry (Tower tech) => +50% arrows and +50% capture points for towers Professional Garrison (Fort tech) => +100% arrows and +100% capture points for forts CCs 2500 => 3000 base capture points. I've saw so much capture CC fails this alpha I don't know why some players still think buildings are too easy to capture. It's just different as you need to garrison it with best units and protect your CC more then using it as if it was actually a fort.  

Towers are not too strong, but a tower full of enemies in your homeland shooting your women after you've just lost most of your troops repelling their invasion is too strong.