The "nazi" crap people are talking about probably refers to the following.
They completely destroyed the trade system. You cannot give items to other players, they have to be within a certain amount of value on both sides, and even at high levels, you can only have a difference in trade value of like 15k per hour. The grand exchange is another problem, since there is no longer any way to barter with other players, which many people found enjoyable.
Also, you can't say anything remotely resembling a cuss word without it being starred out. (Except bullass. For some reason, both bull and ass are both censored, but bullass isn't.)
Also, PvP is almost completely destroyed, since, to my knowledge, there is no longer any way to non-consensually kill someone and take all their stuff. You can only fight through duels or minigames, which are rather boring.
Really, those are the things that made me quit, probably permanently. After they upgraded the graphics, they started destroying everything I actually liked about the game.
Oh yeah, they made it difficult to do some things by making them non-static (to discourage bots).
Basically, the problem is that they tried to crack down on botters and scammers so much, they made it bad for the people who don't cheat.