Yeah, I am not really interested either. I am sure it will be a good movie, and it will probably do well, it's just not my cup of tea in the end. It's the same reason I don't really like the Batman who Laughs stuff. I know some people love it, but the gleeful sadism of the character just makes me uncomfortable. But in the end it's each to their own, some people can appreciate the darkness of a series or movie that features the Joker as the main character and star. I loved Heath Ledger in Dark Knight Returns, but his presence in the movie was balanced out by a fairly strong Batman so he didn't completely dominate the entire movie. He was the breakout character, but not the character we were rooting for, we were meant to root for Batman in Dark Knight Returns and that is how I preferred it.
It's got a lot of accolades and Joaquin Phoenix is a phenomenal actor, I am sure the movie will do well at the theatres, and if it is as well acted and directed as people have said it deserves to do well. I will probably watch it when it comes out on video, just not in the theatre.