I dont mind it, its kinda what an mmorpg is. Or its the thing that makes it recognizable. Its how a mmorpg is built up.
Its like a song. Have you noticed that every song have a chorus? Or every Trance(techno) song have 4 by 4 beat?
Some people that does not like techno says its the same thing over and over again. But the genre is like that. If you just listen to the song for once you will notice that its not the same over and over again but has its own build up.
So an mmorpg is a rpg but its online with massive amount of people playing together like an online fantasy world... its not different from any other rpg game with than its online. So the thing with the classes, levling up. Upgrade, gear it. Get skills. Become stronger. Thats what an rpg is. And its what makes it recognizable.