After playing Warcraft 3 for years I joined World of Warcraft after the "The Burning Crusade" expansions and it did a lot of fun. Hours spend just talking with the Community was one of the best memories I have. And every time they changed it its like a completely new game with just memories of the old to the point where some doesn't enjoy it anymore. It's the time that passes and with it comes and goes what we will someday call a good memory. I personally wouldn't play on a privat server to get that feeling back cause I don't want to ruin those memories. Some games are just over.
I liked the old skill tree but to be fair it needs you to invest time to master it. Or you just googeld for a guide.
Yesterday a friend of mine flamed over the new skill system of League Of Legends cause now can everyone be a decent player but in the end, it's just the pregame.
World of Warcraft was one of the games I will always remember like Gears of War, Halo, Timesplitter and Warcraft. The good old days :)