I personally think changing things up now and then keep the game firmly planted in the skills over gear side of the fence, and that it makes the game that much more interesting to play.
Example...
You start playing, get to lvl 20 and find a build that suits what you wish to do. You continue to mainly use that build in missions and quests (or for farming if that's what you're doing with the build). You keep at it, sticking to what you know cos it works. Then BAM...something changes on your skill bar. There's a skill that has been 'nerfed' and no longer acts the way you need it to.
"Omigosh, whatever will I do?" you say.
Ah...how about changing things up a little? Thinking about the build some more. Trying something different?
"But that means I have to think about the skills and not stick to the same thing endlessly until I no longer even have to look at what I'm doing," you reply.
Why yes...that's because it's a SKILL game. We are meant to think about skills and builds, which is why you can only use 8 at a time. In a way, it should help keep the game interesting. It gives you something to think about. It gives you the opportunity to learn about different builds and how to make them. Oh boy...isn't that an intersting notion for a game about skill?

All I have to say is stop whining when skills change and use your head...yunno, to think of even better builds, rather than wasting your time wringing your hands about it and blaming ANet for spoiling your funs

The game changes a little with every sweeping skill nerf and I for one am glad about it, otherwise it'd be a pretty static game, and I know I for one would grow tired of it a lot quicker. When each skill I use gets suddenly switched on me, I rub my hands together and think "Great, now I get to do something more interesting. Now I get to be the one to come up with a great farming build, tank build, nuker build, etc."
Just play the game how it's meant to be, with skill, and not repetative button bashing with the same old builds. For a game to keep evolving and not die, skill changes must happen. End of story.
Anybody else agree, or am I in the minority?