I think one of the biggest issues of every freeshard are PLAYERS as mentioned before, everytime i was looking for a freeshard i was trying to chose the one with the highest number of players + max content of SA/HS, but as i figured out, there are a lot of people that hate imbuing and the new system.
One of the main reasons to play UO is skill development but another important reason (and for me the fun part) is spending time on making suits from barbed runics or valorite hammers, right now, where i play, there are implemented mostly every single arty from HS and SA, but imbuing is deactivated, so it promotes that kind of old school uo.
I have to say i've played 2 years on an imbuing server and it's not that bad, you only have to get used to it and his new possibilities.
So Players + Development = Success imo.
Sorry for my english i know i messed up with the writing quite a few times.
Good Luck.