Other than a select few updates, RuneScape has gotten continuously better over the years.
This happens whenever any major change happens anywhere ever. People get all nostalgic about the "good old days". I'm glad that when I'm fighting dragons, the graphics are now better than that of the original Half-Life game which came out over 10 years ago.
EoC will bring a fresh and far more interesting perspective to combat. Some people might hate on me for saying this, but if you don't like this new combat system, I'm guessing it's because you won't be able to afk as much (or at least afking won't get you xp as fast as people using all their abilities). In other words, you're just being lazy.
Part of the reason people like my good friend Vephyrus got bored and left the game is because all he had left to do was boss, and every new boss was always mastered within weeks of release and then became a boring task. I don't think that will be the case anymore.