You fell in love with a game and it's characters, sunk hundreds, maybe even thousands of hours into it. It became a comforting, immensely satisfying part of your daily life. Then you heard a sequel was coming and got really hyped but when it came out it was utter rubbish...
I don't think that's a fair assessment of Guild Wars 2. It was not a true sequel to Guild Wars 1 but it's a decent game in its own right. I can see that if you're playing a great city builder game and they announced a sequel, you would be thrown if that sequel was a 4x instead. But in this analogy, it's a damn good 4x and maybe even the best amongst its contemporaries. Plus the original game is still there in all of its charm and originality, they've kept the servers running this long and seem to plan on keeping on doing so until no one is playing.