1. The North Cyprus would be within Federated Cyprus. It would certainly have belonged to everyone who is a citizen of Federated Cyprus.
2. Lots of refugees would have gone back immediately, and figure was around 90,000 - 100,000. That sounds like a lot to me, and certainly a lot more than the current figure of 0. Everyone who was a refugee would eventually be able to go back to his/her village over time, 19 years or on Turkey's entry to the EU
3. The flow of Turks would have stopped. In fact, here is precisely what the Annan plan provided: "In addition, for a transitional period of 19 years or until Turkey’s accession to the European Union, whichever is earlier, Cyprus may limit the right of Greek nationals to reside in Cyprus if their number has reached 5% of the number of resident Cypriot citizens holding Greek Cypriot internal constituent state citizenship status, or the right of Turkish nationals to reside in Cyprus if their number has reached 5% of the number of resident Cypriot citizens holding Turkish Cypriot internal constituent state citizenship status." Given that they are more than 5% that certainly would have stopped the flow.
4. A Cyprus founded on meritocracy? Well, that one I concede could not be guaranteed or even provided by Annan, but there is no way in hell any plan will ever make Cyprus a meritocracy. When run by Cypriots, Cyprus has been, is, and always will be, a nepotistic Koumbarokratia. That isn’t the fault of Annan.
5. The island would have been almost entirely demilitarized over the long term. Initially, each side would reduce to 6,000, then to 3,000, then to 950/650, with total demilitarization being the final goal. Compare that to the current status quo and let us know what you prefer.
6. Kyrenia - yes there would be limitations, but these are gradually relaxed, and after a certain time, anyone who was from Kyrenia could return there, and a certain number of others could have settled there as well.