Well hello this is my opinion on playability depending on the servers population:
CROWDED SERVERS:
If your looking to play with thousands of diferrent players then this is your server style while this has some pros and cons listed below.
Pros
-Populated servers usually have a well built server
-Alot of players
-Diffrent activities
Cons
-Its really hard to get to be server staff
-You cant really get a good friendship with other players
-Trolls and liars which are always present
LOW CROWDED SERVERS:
I prefer this one cause you can really get to know the staff and its not overcrowded with players so you have a better chance of getting reputacion.
Pros
-Get to know the staff
-Staff concentrate on getting the best friendship with players
-More knowledge one the players on the server
Cons
-Low crowded servers tend to be primitive
-Players dont get to know of each other much
-You never know whats going to change

Well this is my view on the population on servers thank you for reading and dont forget to give a diamond
-Mauri Gameplay