The only thing I am sick of is the Random button always giving me Pikachu as an opponent. And not even different Pikachu, the same default one.
Additionally, I am sick of the main theme of the game, but that is not because of the demo. I was sick of it long before that. The demo just makes it worse because that is the only song in the game until you luck out and get the Melee menu once in a while. And this isn't because I don't like the new theme. It's just, that's about the only real music we've heard for most of the time leading up to now.
That said, I was a Link main in SSB64 and solely played Link for most of Melee's lifespan until I opened up and played other characters leading into Brawl. In Brawl, I gravitated towards Toon Link more, but played a lot of characters.
Seeing as I've been playing Link in some form for literally 15 years in SSB, always as a main, this feels no different from playing SSB64 to me, except slightly less characters.
And I love Villager.
So no, not really bored with it. I also only play it a little bit each day. I want to savor this. But I just lucked out that one of my mains and a character I wanted to learn were both playable.