My personal thoughts on Galata tower - I have 2 cities, both with Galata now. The changes being made, in the overall sense are minor, if not immaterial. If I start a 3rd city, I would probably build it. Right now, I am only building up to level 13. The diminishing returns after level 11 make the increased levelling not really worth it (seeing that Level 80 is less than double the chance at Level 7) - but I will level to 13, just so I get the 3rd chance to repel.
The changes to Galata, IMO, is how it should have been done originally, instead of making it quest based.