Here is a good [url=https://whyigame.wordpress.com/2015/09/05/gw2-resolving-cognitive-dissonance-gee-thanks-raids/]blog post[/url] that outlines how the author worked through the disappointment that a game they play took a turn in a direction they did not like - in this particular case the addition of raids to Guild Wars 2.

Naturally this need not apply only to raids. Anything can be put in their place, be it the addition to PvP to a game, crafting, nerfing raids, group content, the lack of raids, etc. For me, the main take-away - or reminder, really - is that it is important to remain focused on the positive aspects to prevent one negative point to ruin an overall good experience.