Game is boring if you have nothing you want to work towards. At least that's how it is for me anyway. If I'm not working towards something, then I usually find myself dead bored :c Although, even with goals, sometimes you can go through a boredom phase, which usually fades after time.
Gotta find a goal (preferably one that takes a while, so you have something to do for a long time) then you won't be bored