I know I've said far more then my share about the merge changes, and would encourage others to provide more input. However, from the perspective of sveral months afterward...
It seems there are still many actual bugs in the system. We frequently get complaints about people in much lower ages being put in with progressive era players. In my neighborhood on B world one of the players was in the industrial age before the merge, and yet others are in the high middle ages, and people haven't been merged out during today's merge. But even far more extreme examples seem to be common. Regardless of how good or bad the actual idea is, if the implementation of the idea in software fails you've got problems.
In addition to that, although I believe the complaints about vast differences in point values between people still have no validity, as point values are not, IMO, a good way to judge people's relative strengths, after tech age, bonuses to offense and defense due (primarily) to great buildings is a very important factor, almost as important as tech age. It would be nice, if and when the bugs are straightened out of the current system, if those bonuses could also be taken into account when determining neighborhood. Perhaps every 30% on offense (that helps attack and defense values) or 70% on defense (that only helps defensive values) could be considered the equivalent of one tech age?
I still think the idea of a merge system that goes off of tech age is better then one that solely goes off of time players or global points. I also think the ability to merge individuals into/out of neighborhoods is better then solely having two small neighborhoods merging. However, those who claim that the new system breaks apart friendships have a good point. Setting people in your neighborhood who you actually do become friendly with as friends in game can help, but sometimes people get to max friends.