I've heard a lot of good stuff about it from people who played it, so that's something. However, I'm definitely not nearly as excited about Triforce Heroes as I would be for any new Zelda release. Every time a new Zelda game gets an announcement, I get super excited. When I first saw the unveiling of Triforce Heroes, I did not feel that rush of excitement.
For me personally, the Four Swords games are the weakest entries in the Zelda series. Four Swords Adventures is still a pretty good game, but the original is pretty mediocre compared to the rest of the games. Granted, it's unfair to say that Triforce Heroes is just another Four Swords, but being a multiplayer Zelda game, I guess it's hard to separate the two.
I think it could go either way. It may be a pleasant surprise, or it may be kinda lame. Aside from the original Four Swords, no Zelda game has ever let me down. I'm hoping Triforce Heroes will be good.