Don't call me a troll, especially with the lack of thought of your post.
Sure, you may not have fought Arthas, but the whole wrath story arc has been WC3 -> Frozen Throne ... and then just toss on "oh, let's fight arthas now" to the very end. That doesn't make anything original. I still stand by my belief that blizzard hasn't had any "new" ideas since Warcraft 3.
I would call you ignorant if you didn't get that feeling of "I've played this game before" when going through half the quest chains that you've gone through. And the quests that didn't pertain specifically to the arthas storyline, were all quests that were on that same mindset. "Fight the scourge, fight arthas' forces, blah blah blah"
Edit:
But I will say that after completing all the dragonblight quests (achievements ftw), the quests are getting a LOT more fun. You only have to go through a couple crap quests to get to the fun ones.